Cambodian personnel at the UN-assisted tribunal have been accused of corruption twice in the past two years, allegedly kicking back part of their salaries to their bosses.

Five former top officials of the Khmer Rouge government are being held awaiting trial before the tribunal, charged with war crimes and crimes against humanity.

The group's radical policies are blamed for the death of up to two million Cambodians when the group was in power in 1975-79, but none of the leaders have ever been brought to trial.