The four warring Cambodian factions said they have agreed on most of the key parts of a U.N.-sponsored plan to end the 12-year civil war in the Southeast Asian country, participants said.

But French Foreign Minister Roland Dumas said Sunday some major issues remained to be solved, included the terms of a cease-fire.The four factions said in a statement they reached agreement on "most of the fundamental points" of the U.N. plan on condition that the parties involved in the conflict make a serious effort to limit the level of fighting.

The plan worked out by the five permanent members of the U.N. Security Council calls for a cease-fire and U.N. supervision of the country in the period leading to free elections.