Anti-regime activist reported government rocket attacks on parts of the central city of Homs and clashes between rebels and government troops in the central town of Rastan, outside of Damascus and elsewhere.
The prospects for talks between the regime and those seeking to topple it appear as distant as ever. Assad's government dismisses the opposition as "armed terrorists."
For their part, opposition leaders say the regime has killed too many civilians to play a role in the conflict's solution.
An Arab League official said that Arab Foreign Ministers will hold an emergency meeting at the Arab League's Cairo headquarters on June 2 to discuss Syria.
The official, speaking on condition of anonymity because he is not authorized to brief the media, said ministers will discuss Annan's peace mission.
Hubbard reported from Beirut.