Cambodia’s UN-backed court has charged Khieu Samphan, one of the former Khmer Rouge leaders, with genocide.

At the Extraordinary Chambers in the Courts of Cambodia (ECCC) tribunal on Dec. 18, 78-year-old Khieu Samphan was charged with involvement in murdering hundreds of thousands of ethnic Cham Muslims and Vietnamese people during the 1975-1979 period.

He was earlier accused of crimes against humanity and war crimes.

Earlier this week, the ECCC for the first time issued genocide charges against two other leaders of the Khmer Rouge regime – Nuon Chea and Ieng Sary. They have already been charged with war crimes and crimes against humanity.

Last month, the ECCC tried and convicted Kaing Guek Eav, also known as Duch, who commanded Tuol S’leng S-21 prison in Phnom Penh./.