A United Nations delegation working to help set up a tribunal to try former Khmer Rouge leaders has arrived in Cambodia.

A U.N. spokesperson says the delegation will work on finalizing the tribunal's budget and settle various logistical issues. A completed budget would allow the United Nations to launch an appeal for donations to run the tribunal.

Last year, the United Nations and Cambodia agreed to establish a tribunal to try top Khmer Rouge leaders on charges of genocide and crimes against humanity.

Cambodia's parliament still must approve legislation on the tribunal. No Khmer Rouge leader has ever been tried and convicted of atrocities in an international court.

Nearly two million people were executed or died from torture, starvation and disease as the Khmer Rouge regime tried to build an agrarian utopia in the late 1970's. Vietnamese forces ousted the Khmer Rouge in 1979.

Some information for this report provided by AFP and Reuters.