1967    Vietnam War: In a propaganda ceremony in Phnom Penh, Cambodia, three American prisoners of war are released by the Viet Cong and turned over to "new left" antiwar activist Tom Hayden.

1971    In Cambodia, Khmer Rouge forces attack the city of Phnom Penh and its airport, killing 44, wounding at least 30 and damaging nine aircraft.

1975    The Cambodian Civil War ends. The Khmer Rouge captures the capital Phnom Penh and Cambodian government forces surrender.

1991    Cambodian Prince Norodom Sihanouk returns to Phnom Penh after thirteen years of exile.

1997    A Vietnam Airlines Tupolev TU-134 crashes on approach into Phnom Penh airport, killing 64.