S-21

S-21 was a prison camp located in Phnom Penh, Cambodia, used by the Khmer Rouge from its rise to power in 1975 to its fall in 1979. It was also known as Tuol Sleng ('hill of the poisonous tree' or 'hill of guilt').

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Formerly the Tuol Svay Prey High School, named after a Royal ancestor of King Sihanouk, the five buildings of the complex were converted in 1975 into a prison and interrogation centre. The Khmer Rouge renamed the complex to Security Prison 21 (S-21) and construction began to adapt the prison to the inmates: The buildings were enclosed in electrified barbed wire, the classrooms converted into tiny prison and torture cells and all the windows were covered with iron bars and barbed wire to prevent prisoner escapes.

Prison camp: Prison camp may be:...

Phnom Penh: Phnom Penh (Khmer: Mul script ; regular script ) is the largest, most populous and capital city of Cambodia. It is also the capital of the Phnom Penh municipality....

Cambodia: The Kingdom of Cambodia (for the various names of the country in Khmer, see naming section below) is a constitutional monarchy in Southeast Asia with a population of more than 13 million people. Most Cambodians are Therevada Buddhists of Khmer extraction. A citizen of Cambodia is usually identified ...