Khmer Rouge survivors and civil party members pray in front of a stupa at the Tuol Sleng genocide museum in Phnom Penh on August 31, 2009. The UN-backed war crimes tribunal into the Khmer Rouge's main jail chief Duch, actual name Kaing Guek Eav, was boycotted by a group of 28 civil parties who are angry with judges for ruling last week to ban them and their lawyers from questioning Duch about his personality in the forthcoming hearings.