Former Khmer Rouge chief prison S-21 Kaing Guek Eav (Duch), stands at the Extraodinary Chambers of the courts of Cambodia in Phnom Penh, in December 2007. Duch wept Tuesday for the victims of Cambodia's 1970s genocide as he re-enacted his alleged crimes for a UN-backed tribunal at the regime's most notorious killing field, a court official said.(AFP/Pool/File/Chor Sokounthea)
A mass grave site containing some thousand human skulls is seen behind a stupa, or religious monument, at Choeung Ek killing field in Phnom Penh, Cambodia, Tuesday, Feb. 26, 2008. The former head of a notorious Khmer Rouge torture center was moved to tears Tuesday when he was taken by Cambodia's genocide tribunal to Choeung Ek, the scene of his alleged crimes, a mass grave site that was one of the country's notorious 'killing fields.' (AP Photo/Heng Sinith)
A Westerner tourist man takes picture of human skulls at Choeung Ek killing field in Phnom Penh, Cambodia, Thursday, Feb. 26, 2008. The former head of a notorious Khmer Rouge torture center was moved to tears Tuesday when he was taken by Cambodia's genocide tribunal to the scene of his alleged crimes, a mass grave site that was one of the country's notorious 'killing fields.' (AP Photo/Heng Sinith)
Tourists look at a mass grave for Khmer Rouge victims at Choeung Ek, 17 km (11 miles) south of Phnom Penh, February 26, 2008. Duch, also known as Kaing Guek Eav, who has confessed in interviews with Western reporters that he committed multiple atrocities as head of Phnom Penh's infamous Tuol Sleng, or S-21, interrogation centre, toured the site on Tuesday to re-enact his crimes for a UN-backed court.REUTERS/Chor Sokunthea (CAMBODIA)
A convoy escorts Kaing Guek Eav, the former Khmer Rouge prison chief at Choeung Ek killing field, to the scene of his alleged crimes, in Phnom Penh, Cambodia, Tuesday, Feb. 26, 2008.(AP Photo/Heng Sinith)
A UN convoy takes Duch, also known as Kaing Guek Eav, to Choeung Ek, 17 km (11 miles) south of Phnom Penh, February 26, 2008. Duch, who has confessed in interviews with Western reporters that he committed multiple atrocities as head of Phnom Penh's infamous Tuol Sleng, or S-21, interrogation centre, toured the site on Tuesday to re-enact his crimes for a UN-backed court.REUTERS/Chor Sokunthea (CAMBODIA)
Cambodian police officers block a road at Choeung Ek killing field in Phnom Penh, Cambodia, Tuesday, Feb. 26, 2008. The former head of a notorious Khmer Rouge torture center was moved to tears Tuesday when he was taken by Cambodia's genocide tribunal to the scene of his alleged crimes, a mass grave site at Choeung Ek, one of the country's notorious 'killing fields.' (AP Photo/Heng Sinith)
Riot police stand guard while awaiting the arrival of a UN convoy carrying Duch, also known as Kaing Guek Eav, in Choeung Ek, 17 km (11 miles) south of Phnom Penh, February 26, 2008. Duch, who has confessed in interviews with Western reporters that he committed multiple atrocities as head of Phnom Penh's infamous Tuol Sleng, or S-21, interrogation centre, toured the site on Tuesday to re-enact his crimes for a UN-backed court.REUTERS/Chor Sokunthea (CAMBODIA)