A United Nations working group says Peru needs to determine the exact number of people missing from its 1980-2000 civil conflict, develop a plan for researching the violence and create a national map of graves holding those killed.

Discussing its visit to Peru, the U.N. delegation said Wednesday that the government should adopt a comprehensive law addressing issues arising from forced "disappearances" by security forces, including working with victims' families and clearly repudiating such violence.

Argentine human rights lawyer Ariel Dulitzky said Peru's military should "make a clear commitment to cooperate with the search for truth and justice."

The conflict pitted Peru's armed forces and self-defense groups against two leftist movements, the Shining Path and the Tupac Amaru Revolutionary Movement. A truth commission estimates as many as 70,000 died.