Tuol Sleng Genocide Museum, the former security office 21 in “Democratic Kampuchea” was created on orders of Pol Pot (Sa lut Saor), in April 1975. Office 21 was called S-21 and designed for detention, interrogation, inhuman torture, and killing after confession from the detainees were received and documented.
On January 7, 1979 the Party and the Government collected all the evidence in S-21 such as photographs, films, the prisoner confession archives, torture tools, shackles and the fourteen victim corpses (one of them was female). Now the evidence of the criminal regime is at display for visitors.
Previously the area hosted Tuol Sleng Primary school and Tuol Svay Prey High school. The four buildings of high school have seen classrooms turned into small cell 0.8 x 2 meters caging individual prisoners. The front of the buildings was covered in a fishnet of barbed wire, preventing prisoners from committing suicide by jumping down.