BEIRUT — A fragile cease-fire brokered by the U.N. took hold in Syria today with regime forces apparently halting widespread attacks on the opposition, but there were reports of scattered violence and the government defied demands by international envoy Kofi Annan to pull troops back to barracks.

A civilian and a Syrian soldier were reported killed after the 6 a.m. cease-fire deadline, but there was no sign of the normally intense shelling, rocket attacks and sniper fire that have become routine.

If the truce holds, it would be the first time the regime has observed an internationally brokered cease-fire since Bashar Assad’s regime launched a brutal crackdown 13 months ago on mass protests calling for his ouster.