In 1975 Toul Svay Prey High School was taken over by Pol Pot’s security forces and turned into a prison known as Security Prison 21 (S-21), It soon became the largest centre of detention and torture in the country. Between 1975 and 1978 more than 17.000 people held at S-21 were taken to the extermination camp at Choeung Ek; detainees who died during torture were buried in mass graves in the prison grounds. When the Vietnamese army liberated Phnom Penh in early 1979, it found only seven prisoners alive at S-21…
