PHNOM PENH, Cambodia (AP) — A U.N.-assisted tribunal on Thursday sentenced two top leaders of Cambodia’s former Khmer Rouge regime to life in prison for crimes against humanity during their late 1970s reign of terror that left as many as 2 million people dead.

The case — involving the forced relocations of people and a mass execution — covered just a sliver of the offenses that led to the deaths of so many of their countrymen through starvation, medical neglect, overwork and execution.