A Syrian opposition official said a fragile cessation of hostilities that took force early on Saturday faced "complete nullification" because of government attacks he said violated the agreement drawn up by the United States and Russia.
Countries backing the Syria peace process will meet at 3 P.M. in Geneva on Monday as France demanded information about attacks in breach of the cessation of hostilities.
Asaad al-Zoubi, head of the Saudi-backed opposition High Negotiations Committee's delegation to peace talks, said the truce had collapsed before it started, Al Arabiya al Hadath TV reported.
The United Nations hopes the cessation of hostilities agreement, which is less binding than a formal cease-fire and was not directly signed by the Syrian warring sides, can precede a more formal cease-fire.