Khalid al-Mihdhar
Encyclopedia
Khalid Muhammad Abdallah al-Mihdhar ' onMouseout='HidePop("72414")' href="/topics/Transliteration">transliterated
Transliteration
Transliteration is a subset of the science of hermeneutics. It is a form of translation, and is the practice of converting a text from one script into another...

 as Almihdhar) (May 16, 1975 – September 11, 2001) was one of five hijackers of American Airlines Flight 77, which was flown into the Pentagon
The Pentagon
The Pentagon is the headquarters of the United States Department of Defense, located in Arlington County, Virginia. As a symbol of the U.S. military, "the Pentagon" is often used metonymically to refer to the Department of Defense rather than the building itself.Designed by the American architect...

 as part of the September 11 attacks.

Mihdhar was born in Saudi Arabia
Saudi Arabia
The Kingdom of Saudi Arabia , commonly known in British English as Saudi Arabia and in Arabic as as-Sa‘ūdiyyah , is the largest state in Western Asia by land area, constituting the bulk of the Arabian Peninsula, and the second-largest in the Arab World...

 and fought in the Bosnian War
Bosnian mujahideen
Bosnian mujahideen were foreign Muslim volunteers who fought on the side of Bosnian Muslims during the 1992–1995 Bosnian war. They arrived in Bosnia with the aim of fighting for Islam and on behalf of Muslims who were at the time brutally attacked by Serbs and Croats in different parts of the...

 during the 1990s. In early 1999, he traveled to Afghanistan
Afghanistan
Afghanistan , officially the Islamic Republic of Afghanistan, is a landlocked country located in the centre of Asia, forming South Asia, Central Asia and the Middle East. With a population of about 29 million, it has an area of , making it the 42nd most populous and 41st largest nation in the world...

 where, as an experienced and respected jihad
Jihad
Jihad , an Islamic term, is a religious duty of Muslims. In Arabic, the word jihād translates as a noun meaning "struggle". Jihad appears 41 times in the Quran and frequently in the idiomatic expression "striving in the way of God ". A person engaged in jihad is called a mujahid; the plural is...

ist, he was selected by Osama bin Laden
Osama bin Laden
Osama bin Mohammed bin Awad bin Laden was the founder of the militant Islamist organization Al-Qaeda, the jihadist organization responsible for the September 11 attacks on the United States and numerous other mass-casualty attacks against civilian and military targets...

 to participate in the attacks. Mihdhar arrived in California
California
California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

 with fellow hijacker Nawaf al-Hazmi
Nawaf al-Hazmi
Nawaf Muhammed Salim al-Hazmi was one of five hijackers of American Airlines Flight 77, which was crashed into the Pentagon as part of the September 11 attacks....

 in January 2000, after traveling to Malaysia for the Kuala Lumpur al-Qaeda Summit. At this point, the CIA
Central Intelligence Agency
The Central Intelligence Agency is a civilian intelligence agency of the United States government. It is an executive agency and reports directly to the Director of National Intelligence, responsible for providing national security intelligence assessment to senior United States policymakers...

 was aware of Mihdhar, and he was photographed in Malaysia with another al-Qaeda
Al-Qaeda
Al-Qaeda is a global broad-based militant Islamist terrorist organization founded by Osama bin Laden sometime between August 1988 and late 1989. It operates as a network comprising both a multinational, stateless army and a radical Sunni Muslim movement calling for global Jihad...

 member who was involved in the USS Cole bombing
USS Cole bombing
The USS Cole Bombing, or the USS Cole Incident, was a suicide attack against the United States Navy destroyer on October 12, 2000 while it was harbored and refueled in the Yemeni port of Aden. Seventeen American sailors were killed, and 39 were injured...

. The CIA did not inform the FBI
Federal Bureau of Investigation
The Federal Bureau of Investigation is an agency of the United States Department of Justice that serves as both a federal criminal investigative body and an internal intelligence agency . The FBI has investigative jurisdiction over violations of more than 200 categories of federal crime...

 when it learned that Mihdhar and Hazmi had entered the United States, and Mihdhar was not placed on any watchlists until late August 2001.

Upon arriving in San Diego, California
California
California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

, Mihdhar and Hazmi were to train as pilots, but spoke English poorly and did not do well with flight lessons
Flight training
Flight training is a course of study used when learning to pilot an aircraft. The overall purpose of primary and intermediate flight training is the acquisition and honing of basic airmanship skills....

. In June 2000, Mihdhar left the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 for Yemen
Yemen
The Republic of Yemen , commonly known as Yemen , is a country located in the Middle East, occupying the southwestern to southern end of the Arabian Peninsula. It is bordered by Saudi Arabia to the north, the Red Sea to the west, and Oman to the east....

, leaving Hazmi behind in San Diego. Mihdhar spent some time in Afghanistan in early 2001 and returned to the United States in early July 2001. He stayed in New Jersey
New Jersey
New Jersey is a state in the Northeastern and Middle Atlantic regions of the United States. , its population was 8,791,894. It is bordered on the north and east by the state of New York, on the southeast and south by the Atlantic Ocean, on the west by Pennsylvania and on the southwest by Delaware...

 in July and August 2001, before arriving in the Washington, D.C.
Washington, D.C.
Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the United States Congress approved the creation of a permanent national capital as permitted by the U.S. Constitution....

 area at the beginning of September 2001.

On the morning of September 11, 2001, Mihdhar boarded American Airlines Flight 77, which was hijacked approximately 30 minutes after take off. The plane was deliberately crashed into the Pentagon, killing all 64 people aboard the flight, along with 125 on the ground.

Aliases

Mihdhar was known under various names including; "Sannan al-Makki", "Khalid bin Muhammad", "Addallah al-Mihdhar" and "Khalid Mohammad al-Saqaf".

Background

Khalid al-Mihdhar was born on May 16, 1975 in Mecca
Mecca
Mecca is a city in the Hijaz and the capital of Makkah province in Saudi Arabia. The city is located inland from Jeddah in a narrow valley at a height of above sea level...

, Saudi Arabia
Saudi Arabia
The Kingdom of Saudi Arabia , commonly known in British English as Saudi Arabia and in Arabic as as-Sa‘ūdiyyah , is the largest state in Western Asia by land area, constituting the bulk of the Arabian Peninsula, and the second-largest in the Arab World...

 to a prominent family, related to the Quraysh tribe of Mecca. Little is known about his life before the age of 20, when he and childhood friend Nawaf al-Hazmi
Nawaf al-Hazmi
Nawaf Muhammed Salim al-Hazmi was one of five hijackers of American Airlines Flight 77, which was crashed into the Pentagon as part of the September 11 attacks....

 went to Bosnia to fight with the mujahideen
Bosnian mujahideen
Bosnian mujahideen were foreign Muslim volunteers who fought on the side of Bosnian Muslims during the 1992–1995 Bosnian war. They arrived in Bosnia with the aim of fighting for Islam and on behalf of Muslims who were at the time brutally attacked by Serbs and Croats in different parts of the...

 in the Bosnian War
Bosnian War
The Bosnian War or the War in Bosnia and Herzegovina was an international armed conflict that took place in Bosnia and Herzegovina between April 1992 and December 1995. The war involved several sides...

. After the war, Mihdhar and Hazmi went to Afghanistan
Afghanistan
Afghanistan , officially the Islamic Republic of Afghanistan, is a landlocked country located in the centre of Asia, forming South Asia, Central Asia and the Middle East. With a population of about 29 million, it has an area of , making it the 42nd most populous and 41st largest nation in the world...

 where they fought alongside the Taliban against the Northern Alliance
United Islamic Front for the Salvation of Afghanistan
The United Islamic Front , known in the West and Pakistan as the Northern Alliance, was a military-political umbrella organization created by the Islamic State of Afghanistan in 1996 under the leadership of Defense Minister Ahmad Shah Massoud...

, and al-Qaeda would later dub Nawaf his "second in command". In 1997, Mihdhar told his family that he was leaving to fight in Chechnya
Chechnya
The Chechen Republic , commonly referred to as Chechnya , also spelled Chechnia or Chechenia, sometimes referred to as Ichkeria , is a federal subject of Russia . It is located in the southeastern part of Europe in the Northern Caucasus mountains. The capital of the republic is the city of Grozny...

, though it is not certain that he actually went to Chechnya. The same year, both men attracted the attention of Saudi intelligence
Intelligence agency
An intelligence agency is a governmental agency that is devoted to information gathering for purposes of national security and defence. Means of information gathering may include espionage, communication interception, cryptanalysis, cooperation with other institutions, and evaluation of public...

, who believed they were involved in arms smuggling, and the following year they were eyed as possible collaborators in the 1998 United States embassy bombings
1998 United States embassy bombings
The 1998 United States embassy bombings were a series of attacks that occurred on August 7, 1998, in which hundreds of people were killed in simultaneous truck bomb explosions at the United States embassies in the East African capitals of Dar es Salaam, Tanzania and Nairobi, Kenya. The date of the...

 in East Africa
East Africa
East Africa or Eastern Africa is the easterly region of the African continent, variably defined by geography or geopolitics. In the UN scheme of geographic regions, 19 territories constitute Eastern Africa:...

 after it emerged that Mohamed Rashed Daoud Al-Owhali
Mohamed Rashed Daoud Al-Owhali
Mohamed Rashed Daoud Al-Owhali is one of the four former al-Qaeda members sentenced in 2001 to life without parole for their parts in the 1998 United States embassy bombings. The others are Mohammed Saddiq Odeh, Khalfan Khamis Mohamed, and Wadih el Hage. At the time of this writing, all four are in...

 had given the FBI the phone number of Mihdhar's father-in-law; 967-1-200578, which turned out to be a key communications hub for al-Qaeda militants, and eventually tipped off the Americans about the upcoming Kuala Lumpur al-Qaeda Summit.

In the late 1990s, Mihdhar married Hoda al-Hada, who was the sister of a comrade from Yemen
Yemen
The Republic of Yemen , commonly known as Yemen , is a country located in the Middle East, occupying the southwestern to southern end of the Arabian Peninsula. It is bordered by Saudi Arabia to the north, the Red Sea to the west, and Oman to the east....

, and they had two daughters. Through marriage, Mihdhar was related to a number of individuals involved with al-Qaeda
Al-Qaeda
Al-Qaeda is a global broad-based militant Islamist terrorist organization founded by Osama bin Laden sometime between August 1988 and late 1989. It operates as a network comprising both a multinational, stateless army and a radical Sunni Muslim movement calling for global Jihad...

 in some way. Mihdhar's father-in-law, Ahmad Muhammad Ali al-Hada, helped facilitate al-Qaeda communications in Yemen, and in late 2001, Mihdhar's brother-in-law, Ahmed al-Darbi, was captured in Azerbaijan
Azerbaijan
Azerbaijan , officially the Republic of Azerbaijan is the largest country in the Caucasus region of Eurasia. Located at the crossroads of Western Asia and Eastern Europe, it is bounded by the Caspian Sea to the east, Russia to the north, Georgia to the northwest, Armenia to the west, and Iran to...

 and sent to Guantanamo Bay
Guantanamo Bay Naval Base
Guantanamo Bay Naval Base is located on of land and water at Guantánamo Bay, Cuba which the United States leased for use as a coaling station following the Cuban-American Treaty of 1903. The base is located on the shore of Guantánamo Bay at the southeastern end of Cuba. It is the oldest overseas...

 on charges of supporting a plot to bomb ships in the Strait of Hormuz
Strait of Hormuz
The Strait of Hormuz is a narrow, strategically important waterway between the Gulf of Oman in the southeast and the Persian Gulf. On the north coast is Iran and on the south coast is the United Arab Emirates and Musandam, an exclave of Oman....

.

Selection for the attacks

In Spring 1999, al-Qaeda founder Osama bin Laden
Osama bin Laden
Osama bin Mohammed bin Awad bin Laden was the founder of the militant Islamist organization Al-Qaeda, the jihadist organization responsible for the September 11 attacks on the United States and numerous other mass-casualty attacks against civilian and military targets...

 committed to support the 9/11 attacks plot, which was largely organized by prominent al-Qaeda member Khalid Sheikh Mohammed. Mihdhar and Hazmi were among the first group of participants selected for the operation, along with Tawfiq bin Attash and Abu Bara al Yemeni
Abu Bara al Yemeni
According to the 9-11 Commission Report Abu Bara al Yemeni was a citizen of Yemen who was slated to participate in al Qaeda's attacks on the United States on September 11, 2001....

, al-Qaeda members from Yemen. Mihdhar, who had spent time in al-Qaeda camps in the 1990s, was known and highly regarded by Bin Laden. Mihdhar was so eager to participate in jihad
Jihad
Jihad , an Islamic term, is a religious duty of Muslims. In Arabic, the word jihād translates as a noun meaning "struggle". Jihad appears 41 times in the Quran and frequently in the idiomatic expression "striving in the way of God ". A person engaged in jihad is called a mujahid; the plural is...

 operations in the United States that he had already obtained a one-year B-1/B-2 (tourist/business) multiple-entry visa
United States visas
United States Visas were issued to 6.6 million foreign nationals visiting the United States and to 470 thousand immigrants in 2008.A foreign national wishing to enter the U.S...

 from the consulate in Jeddah
Jeddah
Jeddah, Jiddah, Jidda, or Jedda is a city located on the coast of the Red Sea and is the major urban center of western Saudi Arabia. It is the largest city in Makkah Province, the largest sea port on the Red Sea, and the second largest city in Saudi Arabia after the capital city, Riyadh. The...

, Saudi Arabia on April 7, 1999, one day after obtaining a new passport. Mihdhar listed the Los Angeles Sheraton
Sheraton Hotels and Resorts
Sheraton Hotels and Resorts is Starwood Hotels & Resorts Worldwide's largest and second oldest brand . Starwood's headquarters are in White Plains, New York.-Sheraton history:...

 as his intended destination.

Once selected, Mihdhar and Hazmi were sent to the Mes Aynak
Mes Aynak
Mes Aynak is located 30 km southeast of Kabul, in a barren region of Logar Province; that is still considered a major transit route for insurgents coming from Pakistan. The mine could be a major boost for the Afghan economy...

 training camp in Afghanistan. In late 1999, Hazmi, Attash and Yemeni went to Karachi
Karachi
Karachi is the largest city, main seaport and the main financial centre of Pakistan, as well as the capital of the province of Sindh. The city has an estimated population of 13 to 15 million, while the total metropolitan area has a population of over 18 million...

, Pakistan
Pakistan
Pakistan , officially the Islamic Republic of Pakistan is a sovereign state in South Asia. It has a coastline along the Arabian Sea and the Gulf of Oman in the south and is bordered by Afghanistan and Iran in the west, India in the east and China in the far northeast. In the north, Tajikistan...

 to see Mohammed, who instructed them on Western culture
Western culture
Western culture, sometimes equated with Western civilization or European civilization, refers to cultures of European origin and is used very broadly to refer to a heritage of social norms, ethical values, traditional customs, religious beliefs, political systems, and specific artifacts and...

 and travel; however, Mihdhar did not go to Karachi, instead returning to Yemen. He was known as Sinaan during the preparations.

Malaysia summit


The CIA
Central Intelligence Agency
The Central Intelligence Agency is a civilian intelligence agency of the United States government. It is an executive agency and reports directly to the Director of National Intelligence, responsible for providing national security intelligence assessment to senior United States policymakers...

 was aware of Mihdhar and Hazmi's involvement with al-Qaeda, having been informed by Saudi intelligence during a 1999 meeting in Riyadh
Riyadh
Riyadh is the capital and largest city of Saudi Arabia. It is also the capital of Riyadh Province, and belongs to the historical regions of Najd and Al-Yamama. It is situated in the center of the Arabian Peninsula on a large plateau, and is home to 5,254,560 people, and the urban center of a...

. Based on information uncovered by the FBI
Federal Bureau of Investigation
The Federal Bureau of Investigation is an agency of the United States Department of Justice that serves as both a federal criminal investigative body and an internal intelligence agency . The FBI has investigative jurisdiction over violations of more than 200 categories of federal crime...

 in the 1998 United States embassy bombings
1998 United States embassy bombings
The 1998 United States embassy bombings were a series of attacks that occurred on August 7, 1998, in which hundreds of people were killed in simultaneous truck bomb explosions at the United States embassies in the East African capitals of Dar es Salaam, Tanzania and Nairobi, Kenya. The date of the...

 case, the National Security Agency
National Security Agency
The National Security Agency/Central Security Service is a cryptologic intelligence agency of the United States Department of Defense responsible for the collection and analysis of foreign communications and foreign signals intelligence, as well as protecting U.S...

 (NSA) began tracking the communications of Hada, Mihdhar's father-in-law. In late 1999, the NSA informed the CIA of an upcoming meeting in Malaysia, which Hada mentioned would involve "Khalid", "Nawaf", and "Salem", who was Hazmi's younger brother, Salem al-Hazmi
Salem al-Hazmi
Salem al-Hazmi was one of five hijackers of American Airlines Flight 77 as part of the September 11 attacks.A Saudi, Hazmi had a relatively long history with al-Qaeda before being selected for the attacks...

.

On January 4, 2000, Mihdhar left Yemen and flew to Dubai
Dubai
Dubai is a city and emirate in the United Arab Emirates . The emirate is located south of the Persian Gulf on the Arabian Peninsula and has the largest population with the second-largest land territory by area of all the emirates, after Abu Dhabi...

, United Arab Emirates
United Arab Emirates
The United Arab Emirates, abbreviated as the UAE, or shortened to "the Emirates", is a state situated in the southeast of the Arabian Peninsula in Western Asia on the Persian Gulf, bordering Oman, and Saudi Arabia, and sharing sea borders with Iraq, Kuwait, Bahrain, Qatar, and Iran.The UAE is a...

, where he spent the night. The CIA broke into his hotel room and photocopied his passport, which gave them his full name, birth information and passport number for the first time, and alerted them that he held an entry visa to the United States. The photocopy was sent to the CIA's Alec Station
Bin Laden Issue Station
The Bin Laden Issue Station was a unit of the Central Intelligence Agency dedicated to tracking Osama bin Laden.Soon after its creation the Station developed a new, deadlier vision of bin Laden's activities. In 1999 the CIA inaugurated a grand "Plan" against al-Qaeda, but struggled to find the...

, which was tracking al-Qaeda.

On January 5, 2000, Mihdhar traveled to Kuala Lumpur
Kuala Lumpur
Kuala Lumpur is the capital and the second largest city in Malaysia by population. The city proper, making up an area of , has a population of 1.4 million as of 2010. Greater Kuala Lumpur, also known as the Klang Valley, is an urban agglomeration of 7.2 million...

, where he joined Hazmi, Attash and Yemeni, who were all arriving from Pakistan. Hamburg cell
Hamburg cell
The Hamburg cell was, according to U.S. and German intelligence agencies, a group of radical Islamists based in Hamburg, Germany that included students who eventually came to be key operatives in the 9/11 attacks...

 member Ramzi bin al-Shibh was also at the summit, and Mohammed possibly attended. The group was in Malaysia to meet with Hambali, the leader of Jemaah Islamiyah
Jemaah Islamiyah
Jemaah Islamiah , is a Southeast Asian militant Islamic organization dedicated to the establishment of a Daulah Islamiyah in Southeast Asia incorporating Indonesia, Malaysia, the southern Philippines, Singapore and Brunei...

, an Asian al-Qaeda affiliate. During the Kuala Lumpur al-Qaeda Summit, many key details of the 9/11 attacks may have been arranged. At the time, the attacks plot had an additional component involving hijacking aircraft in Asia, as well as in the United States. Attash and Yemeni were slated for this part of the plot, however, it was later canceled by Bin Laden for being too difficult to coordinate with United States operations.
In Malaysia, the group stayed with Yazid Sufaat
Yazid Sufaat
The Malaysian Yazid Sufaat was a member of the Islamist terrorist organization Jemaah Islamiyah from shortly after its foundation in 1993 until his arrest by Malaysian authorities on 9 December 2001....

, a local Jemaah Islamiyah member, who provided accommodation at Hambali's request. Both Mihdhar and Hazmi were secretly photographed at the meeting by Malaysian authorities, whom the CIA had asked to provide surveillance
Surveillance
Surveillance is the monitoring of the behavior, activities, or other changing information, usually of people. It is sometimes done in a surreptitious manner...

. The Malaysians reported that Mihdhar spoke at length with Attash, and he met with Fahad al-Quso
Fahd Mohammed Ahmed Al-Quso
Fahd Mohammed Ahmed al-Quso is also known as Fahd Al-Quso, Abu Huthaifah, Abu Huthaifah Al-Yemeni, Abu Al-Bara', Abu Hathayfah Al-Adani, Abu Huthaifah Al-Adani, Fahd Mohammed Ahmed Al-Awlaqi, Huthaifah Al-Yemeni, or Abu Huthaifah Al-Abu Al-Bara. Fahd Mohammed Ahmed al-Quso is a known terrorist...

 and others who were later involved in the USS Cole bombing
USS Cole bombing
The USS Cole Bombing, or the USS Cole Incident, was a suicide attack against the United States Navy destroyer on October 12, 2000 while it was harbored and refueled in the Yemeni port of Aden. Seventeen American sailors were killed, and 39 were injured...

. After the meeting, Mihdhar and Hazmi traveled to Bangkok
Bangkok
Bangkok is the capital and largest urban area city in Thailand. It is known in Thai as Krung Thep Maha Nakhon or simply Krung Thep , meaning "city of angels." The full name of Bangkok is Krung Thep Mahanakhon Amon Rattanakosin Mahintharayutthaya Mahadilok Phop Noppharat Ratchathani Burirom...

, Thailand
Thailand
Thailand , officially the Kingdom of Thailand , formerly known as Siam , is a country located at the centre of the Indochina peninsula and Southeast Asia. It is bordered to the north by Burma and Laos, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the...

 on January 8 and left a week later on January 15 for the United States.

United States entry

On January 15, 2000, Mihdhar and Hazmi arrived at Los Angeles International Airport
Los Angeles International Airport
Los Angeles International Airport is the primary airport serving the Greater Los Angeles Area, the second-most populated metropolitan area in the United States. It is most often referred to by its IATA airport code LAX, with the letters pronounced individually...

 from Bangkok and were admitted as tourists for a period of six months. Immediately after entering the country, Mihdhar and Hazmi met Omar al-Bayoumi
Omar al-Bayoumi
Omar al-Bayoumi is a Saudi national who befriended two of the 9/11 hijackers in the United States.Some people suspect he was a Saudi agent and an accessory to the attacks...

 in an airport restaurant. Bayoumi claimed he was merely being charitable in assisting the two seemingly out-of-place Muslim
Muslim
A Muslim, also spelled Moslem, is an adherent of Islam, a monotheistic, Abrahamic religion based on the Quran, which Muslims consider the verbatim word of God as revealed to prophet Muhammad. "Muslim" is the Arabic term for "submitter" .Muslims believe that God is one and incomparable...

s with moving to San Diego, where he helped them find an apartment near his own, co-signed their lease, and gave them $1,500 to help pay their rent. Mohammed later claimed that he suggested San Diego as their destination, based on information gleaned from a San Diego phone book that listed language and flight schools. Mohammed also recommended that the two seek assistance from the local Muslim community, since neither spoke English nor had experience with Western culture.

While in San Diego, witnesses told the FBI he and Hazmi had a close relationship with Anwar Al Awlaki, an imam who served as their spiritual advisor. Authorities say the two regularly attended the Masjid Ar-Ribat al-Islami
Masjid Ar-Ribat al-Islami
Masjid Ar-Ribat al-Islami is a Sunni mosque in San Diego, California, on 7173 Saranac Street on the San Diego-La Mesa, California border.Anwar Al-Awlaki, who has been accused of being a senior Al-Qaeda recruiter and motivator linked to various terrorists, served as Imam of the mosque from...

 mosque Awlaki led in San Diego, and Awlaki had many closed-door meetings with them, which led investigators to believe Awlaki knew about the 9/11 attacks in advance.

In early February 2000, Mihdhar and Hazmi rented an apartment at the Parkwood Apartments complex in the Clairemont Mesa
Clairemont, San Diego, California
Clairemont is a suburban neighborhood in northern San Diego.It includes the separate neighborhoods of North Clairemont, South Clairemont, Clairemont Mesa East and Clairemont Mesa West...

 area of San Diego, and Mihdhar purchased a used 1988 Toyota Corolla
Toyota Corolla
The Toyota Corolla is a line of subcompact and compact cars manufactured by the Japanese automaker Toyota, which has become very popular throughout the world since the nameplate was first introduced in 1966. In 1997, the Corolla became the best selling nameplate in the world, with over 35 million...

. Neighbors thought that Mihdhar and Hazmi were odd because months passed without the men getting any furniture, and they slept on mattresses on the floor, yet they carried briefcases, were frequently on their mobile phones, and were occasionally picked up by a limousine. Those who met Mihdhar in San Diego described him as "dark and brooding, with a disdain for American culture". Neighbors also said that the pair constantly played flight simulator
Flight simulator
A flight simulator is a device that artificially re-creates aircraft flight and various aspects of the flight environment. This includes the equations that govern how aircraft fly, how they react to applications of their controls and other aircraft systems, and how they react to the external...

 games.

Mihdhar and Hazmi took flight lessons
Flight training
Flight training is a course of study used when learning to pilot an aircraft. The overall purpose of primary and intermediate flight training is the acquisition and honing of basic airmanship skills....

 on May 5, 2000 at the Sorbi Flying Club in San Diego, with Mihdhar flying an aircraft for 42 minutes. They took additional lessons on May 10; however, with poor English skills, they did not do well with flight lessons. Mihdhar and Hazmi raised some suspicion when they offered extra money to their flight instructor, Richard Garza, if he would train them to fly jets. Garza refused the offer but did not report them to authorities. After the 9/11 attacks, Garza described the two men as "impatient students" who "wanted to learn to fly jets, specifically Boeings".

Return to Yemen

Mihdhar and Hazmi moved out of the Parkwood Apartments at the end of May 2000, and Mihdhar transferred registration for the Toyota Corolla to Hazmi. On June 10, 2000, Mihdhar left the United States and returned to Yemen to visit his wife, against the wishes of Mohammed who wanted him to remain in the United States to help Hazmi adapt. Mohammed was so angered by this that he decided to remove Mihdhar from the 9/11 plot, but he was overruled by Bin Laden. Mihdhar remained part of the plot as a muscle hijacker, who would help take over the aircraft. On October 12, 2000, the USS Cole was bombed by a small boat laden with explosives. After the bombing, Yemeni Prime Minister
Prime Minister of Yemen
The Prime Minister of the Republic of Yemen is the head of government in that country. The current Prime Minister, Ali Muhammad Mujawar, has held the position since 7 April 2007. The Prime Minister is appointed by the President...

 Abdul Karim al-Iryani
Abdul Karim al-Iryani
Abdulkarim Ali Al-Eryani was the Prime Minister of Yemen from 29 April 1998 to 31 March 2001...

 reported that Mihdhar had been one of the key planners of the attack and had been in the country at the time of the attacks. In late 2000, Mihdhar was back in Saudi Arabia, staying with a cousin in Mecca.

2001

In February 2001, Mihdhar returned to Afghanistan for several months, possibly entering across the Iran
Iran
Iran , officially the Islamic Republic of Iran , is a country in Southern and Western Asia. The name "Iran" has been in use natively since the Sassanian era and came into use internationally in 1935, before which the country was known to the Western world as Persia...

ian border after a flight from Syria
Syria
Syria , officially the Syrian Arab Republic , is a country in Western Asia, bordering Lebanon and the Mediterranean Sea to the West, Turkey to the north, Iraq to the east, Jordan to the south, and Israel to the southwest....

. FBI director Robert Mueller
Robert Mueller
Robert Swan Mueller III is the 6th and current Director of the United States Federal Bureau of Investigation .-Early life:...

 later stated his belief that Mihdhar served as the coordinator and organizer for the muscle hijackers. He was the last of the muscle hijackers to return to the United States. On June 10, he returned to Saudi Arabia for a month, where he applied to re-enter the United States through the Visa Express
Visa Express
The Visa Express program was a U.S. State Department program that allowed residents of Saudi Arabia to enter the U.S. without proving their identities. It became controversial when some of the 9/11 hijackers used this program to gain entry into the country, and the program was eventually shut...

 program, indicating that he intended to stay at a Marriott hotel
Marriott International
Marriott International, Inc. is a worldwide operator and franchisor of a broad portfolio of hotels and related lodging facilities. Founded by J. Willard Marriott, the company is now led by son J.W. Marriott, Jr...

 in New York City. On his visa application, Mihdhar falsely stated that he had never previously traveled to the United States.

On July 4, Mihdhar returned to the United States, arriving at New York City's John F. Kennedy International Airport
John F. Kennedy International Airport
John F. Kennedy International Airport is an international airport located in the borough of Queens in New York City, about southeast of Lower Manhattan. It is the busiest international air passenger gateway to the United States, handling more international traffic than any other airport in North...

, using a new passport obtained the previous month. A digital copy of one of Mihdhar's passports was later recovered during a search of an al-Qaeda safe house
Safe house
In the jargon of law enforcement and intelligence agencies, a safe house is a secure location, suitable for hiding witnesses, agents or other persons perceived as being in danger...

 in Afghanistan, which held indicators, such as fake or altered passport stamps, that Mihdhar was a member of a known terrorist group. At the time when Mihdhar was admitted to the United States, immigration inspectors had not been trained to look for such indicators. Upon arriving, Mihdhar did not check into the Marriott but instead spent a night at another hotel in the city.

Mihdhar bought a fake ID
Identity document forgery
Identity document forgery is the process by which identity documents issued by governing bodies are copied and/or modified by persons not authorized to create such documents or engage in such modifications, for the purpose of deceiving those who would view the documents about the identity or status...

 on July 10 from All Services Plus in Passaic County, New Jersey
Passaic County, New Jersey
Passaic County is a county located in the U.S. state of New Jersey. As of the 2010 Census, the population was 501,226. Its county seat is Paterson...

, which was in the business of selling counterfeit documents, including another ID to Flight 11
American Airlines Flight 11
American Airlines Flight 11 was American Airlines' daily scheduled morning transcontinental flight from Logan International Airport, in Boston, Massachusetts, to Los Angeles International Airport, in Los Angeles, California...

 hijacker Abdulaziz al-Omari
Abdulaziz al-Omari
An airport security guard and Imam, Abdulaziz al-Omari was one of five hijackers of American Airlines Flight 11 as part of the September 11 attacks....

. On August 1, Mihdhar and fellow Flight 77 hijacker Hani Hanjour
Hani Hanjour
Hani Saleh Hasan Hanjour was the hijacker-pilot of American Airlines Flight 77, crashing the plane into the Pentagon as part of the September 11 attacks....

 drove to Virginia
Virginia
The Commonwealth of Virginia , is a U.S. state on the Atlantic Coast of the Southern United States. Virginia is nicknamed the "Old Dominion" and sometimes the "Mother of Presidents" after the eight U.S. presidents born there...

 in order to obtain driver's licenses. Once they arrived, they scouted out a 7-Eleven
7-Eleven
7-Eleven is part of an international chain of convenience stores, operating under Seven-Eleven Japan Co. Ltd, which in turn is owned by Seven & I Holdings Co...

 convenience store and a dollar store in Falls Church
Falls Church, Virginia
The City of Falls Church is an independent city in Virginia, United States, in the Washington Metropolitan Area. The city population was 12,332 in 2010, up from 10,377 in 2000. Taking its name from The Falls Church, an 18th-century Anglican parish, Falls Church gained township status within...

, and found two Salvadoran
El Salvador
El Salvador or simply Salvador is the smallest and the most densely populated country in Central America. The country's capital city and largest city is San Salvador; Santa Ana and San Miguel are also important cultural and commercial centers in the country and in all of Central America...

 immigrants who, for $50 each, were willing to vouch for Mihdhar and Hanjour as Virginia residents. With notarized residency forms, Mihdhar and Hanjour were able to obtain driver's licenses at a Virginia motor vehicle office. Flight 77 hijackers Salem al-Hazmi
Salem al-Hazmi
Salem al-Hazmi was one of five hijackers of American Airlines Flight 77 as part of the September 11 attacks.A Saudi, Hazmi had a relatively long history with al-Qaeda before being selected for the attacks...

 and Majed Moqed
Majed Moqed
A former law student, Majed Mashaan Ghanem Moqed was one of five hijackers of American Airlines Flight 77 as part of the September 11 attacks....

, and United Airlines Flight 93
United Airlines Flight 93
United Airlines Flight 93 was United Airlines' scheduled morning transcontinental flight across the United States from Newark International Airport in Newark, New Jersey, to San Francisco International Airport in California. On Tuesday, September 11, 2001, the Boeing 757–222 aircraft operating the...

 hijacker Ziad Jarrah
Ziad Jarrah
Ziad Samir Jarrah was one of the masterminds of the September 11 attacks who served as the hijacker-pilot of United Airlines Flight 93, crashing the plane into a field in a rural area near Shanksville—after a passenger uprising—as part of the coordinated attacks.After a wealthy and secular...

 used the same addresses obtained from the Salvadorans to obtain Virginia driver's licenses.

In August 2001, Mihdhar and Hazmi made several visits to the library at William Paterson University
William Paterson University
William Paterson University is a comprehensive public institution located in Wayne, New Jersey serving nearly 11,000 undergraduate and graduate students through five colleges: , , , , and ....

 in Wayne, New Jersey
Wayne, New Jersey
Wayne is a Township in Passaic County, New Jersey, United States, located less than from midtown Manhattan. As of the United States 2000 Census, the township had a total population of 54,069....

, where they used computers to look up travel information and book flights. On August 22, Mihdhar and Hazmi tried to purchase flight tickets from the American Airlines online ticket-merchant, but had technical difficulties and gave up. Mihdhar and Moqed were able make flight reservations for Flight 77 on August 25, using Moqed's credit card; however, the transaction did not fully go through because the billing address and the shipment address for the tickets did not match.

On August 31, Mihdhar closed an account at Hudson United Bank
TD Banknorth
TD Banknorth, formerly just Banknorth, was a wholly owned subsidiary of the Toronto-Dominion Bank which conducted banking and insurance activities, primarily serving the northeastern area of the United States, headquartered in Portland, Maine...

 in New Jersey, having opened the account when he arrived in July, and was with Hanjour when he made a withdrawal from an ATM in Paterson
Paterson, New Jersey
Paterson is a city serving as the county seat of Passaic County, New Jersey, United States. As of the 2010 United States Census, its population was 146,199, rendering it New Jersey's third largest city and one of the largest cities in the New York City Metropolitan Area, despite a decrease of 3,023...

 on September 1. The next day, Mihdhar, Moqed and Hanjour traveled to Maryland
Maryland
Maryland is a U.S. state located in the Mid Atlantic region of the United States, bordering Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware to its east...

, where they stayed at budget motels in Laurel
Laurel, Maryland
Laurel is a city in northern Prince George's County, Anne Arundel County, and Howard County, Maryland, United States, located midway between Washington, D.C. and Baltimore. Incorporated in 1870, the city maintains a historic district including its Main Street...

. Mihdhar was among the muscle hijackers who worked out at a Gold's Gym
Gold's Gym
Gold's Gym International, Inc. is an international chain of co-ed fitness centers originally started in California by Joe Gold. Each gym features a wide array of exercise equipment, group exercise classes and personal trainers to assist clients...

 in Greenbelt
Greenbelt, Maryland
Greenbelt is a city in Prince George's County, Maryland, United States. Contained within today's City of Greenbelt is the historic planned community now known locally as "Old Greenbelt" and designated as the Greenbelt Historic District...

 in early September. On September 5, Mihdhar and Moqed went to the American Airlines ticket counter at Baltimore-Washington International Airport to pick up their tickets for Flight 77, paying $2,300 in cash.

Intelligence leads

Mihdhar was placed on a CIA watchlist on August 21, 2001, and a note was sent on August 23 to the Department of State
United States Department of State
The United States Department of State , is the United States federal executive department responsible for international relations of the United States, equivalent to the foreign ministries of other countries...

 and the Immigration and Naturalization Service
Immigration and Naturalization Service
The United States Immigration and Naturalization Service , now referred to as Legacy INS, ceased to exist under that name on March 1, 2003, when most of its functions were transferred from the Department of Justice to three new components within the newly created Department of Homeland Security, as...

 (INS) suggesting that Mihdhar and Hazmi be added to their watchlists. The Federal Aviation Administration
Federal Aviation Administration
The Federal Aviation Administration is the national aviation authority of the United States. An agency of the United States Department of Transportation, it has authority to regulate and oversee all aspects of civil aviation in the U.S...

 (FAA) was not notified about the two men. On August 23, the CIA informed the FBI that Mihdhar had obtained a U.S. visa in Jeddah. The FBI headquarters received a copy of the Visa Express application from the Jeddah embassy on August 24, showing the New York Marriott as Mihdhar's destination.

On August 28, the FBI New York field office requested that a criminal case be opened to determine whether Mihdhar was still in the United States, but the request was refused. The FBI ended up treating Mihdhar as an intelligence case, which meant that the FBI's criminal investigators could not work on the case, due to the barrier separating intelligence and criminal case operations. An agent in the New York office sent an e-mail to FBI headquarters saying, "Whatever has happened to this, someday someone will die, and the public will not understand why we were not more effective and throwing every resource we had at certain 'problems.'" The reply from headquarters was, "we [at headquarters] are all frustrated with this issue ... [t]hese are the rules. NSLU
National Security Law Unit
Within the American Federal Bureau of Investigation, the National Security Law Unit forms part of the Office of the General Counsel It was previously led by Michael J. Woods....

 does not make them up."

The FBI contacted Marriott on August 30, requesting that they check guest records, and on September 5, they reported that no Marriott hotels had any record of Mihdhar checking in. The day before the attacks, the New York office requested that the Los Angeles FBI office check all local Sheraton Hotel
Sheraton Hotels and Resorts
Sheraton Hotels and Resorts is Starwood Hotels & Resorts Worldwide's largest and second oldest brand . Starwood's headquarters are in White Plains, New York.-Sheraton history:...

s, as well as Lufthansa
Lufthansa
Deutsche Lufthansa AG is the flag carrier of Germany and the largest airline in Europe in terms of overall passengers carried. The name of the company is derived from Luft , and Hansa .The airline is the world's fourth-largest airline in terms of overall passengers carried, operating...

 and United Airlines
United Airlines
United Air Lines, Inc., is the world's largest airline with 86,852 employees United Air Lines, Inc., is the world's largest airline with 86,852 employees United Air Lines, Inc., is the world's largest airline with 86,852 employees (which includes the entire holding company United Continental...

 bookings, because those were the two airlines Mihdhar had used to enter the country. Neither the Treasury Department
United States Department of the Treasury
The Department of the Treasury is an executive department and the treasury of the United States federal government. It was established by an Act of Congress in 1789 to manage government revenue...

's Financial Crimes Enforcement Network
Financial Crimes Enforcement Network
The Financial Crimes Enforcement Network is a bureau of the United States Department of the Treasury that collects and analyzes information about financial transactions in order to combat money laundering, terrorist financiers, and other financial crimes.As reflected in its name, the Financial...

 nor the FBI's Financial Review Group, which have access to credit card and other private financial records, were notified about Mihdhar prior to September 11.

Regarding the CIA's refusal to inform the FBI about Mihdhar and Hazmi, author Lawrence Wright
Lawrence Wright
Lawrence Wright is a Pulitzer Prize-winning American author, screenwriter, staff writer for The New Yorker magazine, and fellow at the Center for Law and Security at the New York University School of Law...

 suggests the CIA wanted to protect its turf and was concerned about giving sensitive intelligence to FBI Agent John P. O'Neill
John P. O'Neill
John Patrick O'Neill was an American counter-terrorism expert, who worked as a special agent and eventually a Special Agent in Charge in the Federal Bureau of Investigation until late 2001...

, who Alec Station chief Michael Scheuer
Michael Scheuer
Michael F. Scheuer is a former CIA intelligence officer, American blogger, historian, foreign policy critic, and political analyst. He is currently an adjunct professor at Georgetown University's Center for Peace and Security Studies...

 described as duplicitous. Wright also speculates that the CIA may have been protecting intelligence operations overseas, and might have been eying Mihdhar and Hazmi as recruitment targets to obtain intelligence on al-Qaeda, although the CIA was not authorized to operate in the United States and might have been leaving them for Saudi intelligence to recruit.

Attacks

On September 10, 2001, Mihdhar and the other hijackers checked into the Marriott Residence Inn
Marriott International
Marriott International, Inc. is a worldwide operator and franchisor of a broad portfolio of hotels and related lodging facilities. Founded by J. Willard Marriott, the company is now led by son J.W. Marriott, Jr...

 in Herndon, Virginia
Herndon, Virginia
Herndon is a town in Fairfax County, Virginia, in the Washington, D.C. metropolitan area of the United States. The population was 21,655 at the 2000 census, which makes it the largest of three towns in the county.-History:...

, near Washington Dulles International Airport
Washington Dulles International Airport
Washington Dulles International Airport is a public airport in Dulles, Virginia, 26 miles west of downtown Washington, D.C. The airport serves the Baltimore-Washington-Northern Virginia metropolitan area centered on the District of Columbia. It is named after John Foster Dulles, Secretary of...

. Saleh Ibn Abdul Rahman Hussayen
Saleh Ibn Abdul Rahman Hussayen
Saleh Ibn Abdul Rahman Hussayen is a prominent Saudi government official who fell under suspicion following the Sept 11th attacks when it was discovered that three of the hijackers, Hani Hanjour, Khalid Almihdhar, and Nawaf Alhazmi had checked into the Marriott Residence Inn in Herndon, Virginia,...

, a prominent Saudi government official, was staying at the same hotel that night, although there is no evidence that they met or knew of each other's presence.

At 06:22 on September 11, 2001, the group checked out of the hotel and headed to Dulles airport. At 07:15, Mihdhar and Moqed checked in at the American Airlines ticket counter and arrived at the passenger security checkpoint at 07:20. Both men set off the metal detector
Metal detector
A metal detector is a device which responds to metal that may not be readily apparent.The simplest form of a metal detector consists of an oscillator producing an alternating current that passes through a coil producing an alternating magnetic field...

 and were put through secondary screening. Security video footage later released shows that Moqed was wanded, but the screener did not identify what set off the alarm, and both Moqed and Mihdhar were able to proceed without further hindrance. Mihdhar was also selected by the Computer Assisted Passenger Prescreening System
Computer Assisted Passenger Prescreening System
The Computer Assisted Passenger Prescreening System is a counter-terrorism system in place in the United States air travel industry...

 (CAPPS), which involved extra screening of his luggage; however, because Mihdhar did not check any luggage, this had no effect. By 07:50, Mihdhar and the other hijackers, carrying knives and box cutters, had made it through the airport security checkpoint and boarded Flight 77 to Los Angeles. Mihdhar was seated in seat 12B, next to Moqed.

The flight was scheduled to depart from Gate D26 at 08:10 but was delayed by 10 minutes. The last routine radio communication from the plane to air traffic control
Air traffic control
Air traffic control is a service provided by ground-based controllers who direct aircraft on the ground and in the air. The primary purpose of ATC systems worldwide is to separate aircraft to prevent collisions, to organize and expedite the flow of traffic, and to provide information and other...

 occurred at 08:50:51. At 08:54, Flight 77 deviated from its assigned flight path and began to turn south, at which point the hijackers set the flight's autopilot
Autopilot
An autopilot is a mechanical, electrical, or hydraulic system used to guide a vehicle without assistance from a human being. An autopilot can refer specifically to aircraft, self-steering gear for boats, or auto guidance of space craft and missiles...

 setting for Washington, D.C. Passenger Barbara Olson
Barbara Olson
Barbara Olson was a lawyer and conservative American television commentator who worked for CNN, Fox News Channel, and several other outlets...

 called her husband, United States Solicitor General
United States Solicitor General
The United States Solicitor General is the person appointed to represent the federal government of the United States before the Supreme Court of the United States. The current Solicitor General, Donald B. Verrilli, Jr. was confirmed by the United States Senate on June 6, 2011 and sworn in on June...

 Ted Olson
Theodore Olson
Theodore Bevry Olson is a former United States Solicitor General, serving from June 2001 to July 2004 under President George W. Bush.- Early life :...

, and reported that the plane had been hijacked. At 09:37:45, Flight 77 crashed into the west facade
Facade
A facade or façade is generally one exterior side of a building, usually, but not always, the front. The word comes from the French language, literally meaning "frontage" or "face"....

 of the Pentagon
The Pentagon
The Pentagon is the headquarters of the United States Department of Defense, located in Arlington County, Virginia. As a symbol of the U.S. military, "the Pentagon" is often used metonymically to refer to the Department of Defense rather than the building itself.Designed by the American architect...

, killing all 64 people aboard, along with 125 in the Pentagon. In the recovery process, remains of the five hijackers were identified through process of elimination
Process of elimination
Process of elimination is a method to identify an entity of interest among several ones by excluding all other entities.-In education testing:...

, since their DNA
DNA
Deoxyribonucleic acid is a nucleic acid that contains the genetic instructions used in the development and functioning of all known living organisms . The DNA segments that carry this genetic information are called genes, but other DNA sequences have structural purposes, or are involved in...

 did not match any from the victims, and put into the custody of the FBI.

Aftermath

After the attacks, the identification of Mihdhar was one of the first links suggesting that Bin Laden had played a role in their organization, since Mihdhar had been seen at the Malaysian conference speaking to Bin Laden's associates. The FBI interrogated Quso, who was arrested following the USS Cole bombing and in custody in Yemen. Quso was able to identify Mihdhar, Hazmi and Attash in photos provided by the FBI, and he also knew Marwan al-Shehhi
Marwan al-Shehhi
Marwan Yousef Mohamed Rashid Lekrab al-Shehhi was the hijacker-pilot of United Airlines Flight 175, crashing the plane into the South Tower of the World Trade Center as part of the September 11 attacks....

, a hijacker aboard United Airlines Flight 175
United Airlines Flight 175
United Airlines Flight 175 was United Airlines' daily scheduled morning transcontinental flight, from Logan International Airport in Boston, Massachusetts, to Los Angeles International Airport in Los Angeles, California...

. From Quso, the FBI was able to establish an al-Qaeda link to the attacks.

On September 12, 2001, the Toyota Corolla purchased by Mihdhar was found in Dulles International Airport's hourly parking lot. Inside the vehicle, authorities found a letter written by Mohamed Atta
Mohamed Atta
Mohamed Mohamed el-Amir Awad el-Sayed Atta was one of the masterminds and the ringleader of the September 11 attacks who served as the hijacker-pilot of American Airlines Flight 11, crashing the plane into the North Tower of the World Trade Center as part of the coordinated attacks.Born in 1968...

, a hijacker aboard American Airlines Flight 11
American Airlines Flight 11
American Airlines Flight 11 was American Airlines' daily scheduled morning transcontinental flight from Logan International Airport, in Boston, Massachusetts, to Los Angeles International Airport, in Los Angeles, California...

; maps of Washington, D.C. and New York City; a cashier's check made out to a Phoenix, Arizona
Phoenix, Arizona
Phoenix is the capital, and largest city, of the U.S. state of Arizona, as well as the sixth most populated city in the United States. Phoenix is home to 1,445,632 people according to the official 2010 U.S. Census Bureau data...

 flight school; four drawings of a Boeing 757
Boeing 757
The Boeing 757 is a mid-size, narrow-body twin-engine jet airliner manufactured by Boeing Commercial Airplanes. Passenger versions of the twinjet have a capacity of 186 to 289 persons and a maximum range of , depending on variant and cabin configuration...

 cockpit; a box cutter; and a page with notes and phone numbers, which contained evidence that led investigators to San Diego.

On September 19, 2001, the Federal Deposit Insurance Corporation
Federal Deposit Insurance Corporation
The Federal Deposit Insurance Corporation is a United States government corporation created by the Glass–Steagall Act of 1933. It provides deposit insurance, which guarantees the safety of deposits in member banks, currently up to $250,000 per depositor per bank. , the FDIC insures deposits at...

 (FDIC) distributed a special alert that listed Mihdhar as still alive, and other reports began suggesting that a number of the alleged hijackers were likewise still alive. For instance, on September 23, 2001, the BBC
BBC News
BBC News is the department of the British Broadcasting Corporation responsible for the gathering and broadcasting of news and current affairs. The department is the world's largest broadcast news organisation and generates about 120 hours of radio and television output each day, as well as online...

 published an article that suggested Mihdhar and others named as hijackers were still at large. The German magazine Der Spiegel
Der Spiegel
Der Spiegel is a German weekly news magazine published in Hamburg. It is one of Europe's largest publications of its kind, with a weekly circulation of more than one million.-Overview:...

 later investigated the BBC's claims of "living" hijackers and reported they were cases of mistaken identities. In 2002, Saudi officials stated that the names of the hijackers were correct and that 15 of the 19 hijackers were Saudi. In 2006, in response to 9/11 conspiracy theories
9/11 conspiracy theories
9/11 conspiracy theories are theories that disagree with the widely accepted account that the September 11 attacks were perpetrated solely by al-Qaeda. These theories arose because of what proponents of the conspiracy theories believe to be inconsistencies in the official conclusions or some...

 surrounding its original news story, the BBC said that confusion had arisen with the common Arabic names, and that its later reports on the hijackers superseded its original story.

In 2005, Army
United States Army
The United States Army is the main branch of the United States Armed Forces responsible for land-based military operations. It is the largest and oldest established branch of the U.S. military, and is one of seven U.S. uniformed services...

 Lt. Col
Lieutenant colonel
Lieutenant colonel is a rank of commissioned officer in the armies and most marine forces and some air forces of the world, typically ranking above a major and below a colonel. The rank of lieutenant colonel is often shortened to simply "colonel" in conversation and in unofficial correspondence...

. Anthony Shaffer
Anthony Shaffer (intelligence officer)
Anthony Shaffer is a U.S. Army Lieutenant Colonel who gained fame for his claims about mishandled intelligence before the September 11 attacks and for the censoring of his book, Operation Dark Heart....

 and Congressman Curt Weldon
Curt Weldon
Wayne Curtis "Curt" Weldon is an American politician. He served as a Republican member of the United States House of Representatives from 1987 to 2007, representing the 7th district of Pennsylvania. He was defeated in November 2006 for reelection by Joe Sestak. Weldon was vice-chair of the Armed...

 alleged that the Defense Department
United States Department of Defense
The United States Department of Defense is the U.S...

 data mining
Data mining
Data mining , a relatively young and interdisciplinary field of computer science is the process of discovering new patterns from large data sets involving methods at the intersection of artificial intelligence, machine learning, statistics and database systems...

 project Able Danger
Able Danger
Able Danger was a classified military planning effort led by the U.S. Special Operations Command and the Defense Intelligence Agency...

 identified Mihdhar, Hazmi, Shehhi and Atta as members of a Brooklyn
Brooklyn
Brooklyn is the most populous of New York City's five boroughs, with nearly 2.6 million residents, and the second-largest in area. Since 1896, Brooklyn has had the same boundaries as Kings County, which is now the most populous county in New York State and the second-most densely populated...

-based al-Qaeda cell
Clandestine cell system
A clandestine cell structure is a method for organizing a group of people in such a way that it can more effectively resist penetration by an opposing organization. Depending on the group's philosophy, its operational area, the communications technologies available, and the nature of the mission,...

 in early 2000. Shaffer largely based his allegations on the recollections of Navy
United States Navy
The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

 Captain
Captain (naval)
Captain is the name most often given in English-speaking navies to the rank corresponding to command of the largest ships. The NATO rank code is OF-5, equivalent to an army full colonel....

 Scott Phillpott
Scott Phillpott
A US Naval captain, Scott Phillpott came to prominence after informing the 2004 9/11 Commission that a data-mining project named Able Danger had identified hijack leader Mohammad Atta as a threat tied to Al-Qaeda and living in Brooklyn as early as January 2000, many months before his attack in...

, who later recanted his recollection, telling investigators that he was "convinced that Atta was not on the chart that we had". Phillpott said that Shaffer was "relying on my recollection 100 percent", and the Defense Department Inspector General's report indicated that Philpott strongly supported the social network analysis techniques used in Able Danger, and might have exaggerated claims of identifying the hijackers.
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