Chronicling Genocide: Inside The Khmer Rouge (PHOTOS)HarrowingBefore the Khmer Rouge murdered innocents in the S-21 killing camp in Cambodia, they photographed them. These are a few of the 6,000 recovered images of the nameless victims. Michael MoynihanUpdated Jul. 11, 2017 7:17PM ET / Published Oct. 20, 2013 7:39PM ET Tuol Sleng Museum of Genocide