Disagreements have arisen at the Khmer Rouge tribunal in Cambodia over whether more people should be investigated.

The UN-appointed prosecutor asked judges to intervene after he and his Cambodian counterpart were unable to move forward. [The UN prosecutor wants more people investigated.]

It is the first time that international and Cambodian officials have had a public disagreement since the tribunal started two years ago.

The court is looking into the deaths of some two million people in the 1970s.