Notable prison massacres

• The first recorded incident was during the Black July
  Black July
  Black July is the commonly used name for the anti-Tamil pogrom and attacks carried out by mobs in Sri Lanka which began on July 23, 1983. The riots occurred following a deadly ambush by a Tamil militant organization known as Liberation Tigers of Tamil Eelam which killed 13 Sri Lanka Army soldiers...
  
   pogrom
  Pogrom
  A pogrom is a form of violent riot, a mob attack directed against a minority group, and characterized by killings and destruction of their homes and properties, businesses, and religious centres...
  
   of 1983, at the Welikada
  Welikada prison massacre
  The Welikada Prison Massacre took place during the 1983 Black July pogrom against Sri Lankan Tamil minority in Colombo, Sri Lanka. Fifty-three prisoners were killed inside a high-security prison. No one has been convicted of crimes relating to these incidents.- Crime scene :The prison is shaped as...
  
   high security prison in which 53 minority
  Minority group
  A minority is a sociological group within a demographic. The demographic could be based on many factors from ethnicity, gender, wealth, power, etc. The term extends to numerous situations, and civilizations within history, despite the misnomer of minorities associated with a numerical statistic...
  
   Tamil political detainees were hacked to death by their fellow Sinhalese
  Sinhalese people
  The Sinhalese are an Indo-Aryan ethnic group,forming the majority of Sri Lanka,constituting 74% of the Sri Lankan population.They number approximately 15 million worldwide.The Sinhalese identity is based on language, heritage and religion. The Sinhalese speak Sinhala, an Indo-Aryan language and the...
  
   prisoners.

• The second incident happened in 2000 when 26 young minority Tamil detainees were massacred by Sinhalese
  Sinhalese people
  The Sinhalese are an Indo-Aryan ethnic group,forming the majority of Sri Lanka,constituting 74% of the Sri Lankan population.They number approximately 15 million worldwide.The Sinhalese identity is based on language, heritage and religion. The Sinhalese speak Sinhala, an Indo-Aryan language and the...
  
   villages at the Bindunuwewa
  Bindunuwewa massacre
  The Bindunuwewa Massacre or Bindunuwewa Prison Massacre took place on October 24, 2000 at a detention center of Bindunuwewa, Sri Lanka, resulting in the deaths of 26 minority Tamil political prisoners by a mob of majority Sinhalese.-Camp:...
  
   low security detention center.

• There was also a prison massacre in which 3 minority Tamil detainees were massacred at the Kalutara
  Kalutara prison massacre
  The Kalutara Prison Riots occurred on December 12, 1997, at the high-security prison in Kalutara, Sri Lanka. Three minority Tamil political prisoners were killed by majority Sinhalese prisoners...
  
  high security detention center.