Four former top Khmer Rouge leaders go on trial for genocide at Cambodia 's UN-backed war crimes court on Monday in a case described as the world's most complex in decades.
The trial has been long awaited by survivors of the brutal regime that wiped out nearly a quarter of the population during its 1975-79 reign of terror.
The elderly defendants, including "Brother Number Two" Nuon Chea and former head of state Khieu Samphan, are to appear at an initial hearing at 09:00am (0200 GMT).
