people were killed by the khmer rouge in this notorious prison in phnom penh. most of the victims themselves were members of the khmer rouge. this is a historian of the pol pot regime. he says the system was riddled with fears of traders from within its own ranks. >> we had to know that during the khmer rouge there was a lot of suspicion around them. not only the normal people they arrest and tortured, but also within the system. reporter: many of the perpetrators see themselves as victims. he regularly visits and interviews members of the khmer rouge for his research. this man is one of them. he says he was 16 years old and the khmer rouge recruited him to work as a guard in an internment camp. he has asked to remain anonymous. >> people were interrogated, tortured and killed in the camp. their individual fate depended on the gravity of their perceived offenses. reporter: his job was to administer a list of suspects names. he says he never committed any act of violence himself. >> under pol pot there was no choice. you had to obey all orders. otherwise you were severely punished.
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