Former Tuol Sleng security guard Chheam Soeur told the UN-backed court on Wednesday that Duch had ordered his subordinates to burn alive a Western prisoner in his infamous Khmer Rouge torture center.

Chheam Soeur said he watched three security guards bring the prisoner into the prison courtyard, place vehicle tires over him, and set them alight.

He said he didn’t know the identity of the prisoner. Duch, who is facing numerous atrocity crimes charges, told the court Wednesday he ordered a subordinate to kill two Western prisoners by tire-burning.