A Syrian government air strike northeast of Damascus killed at least 80 people in a marketplace on Sunday, rescue workers in the rebel-held area and the Syrian Observatory for Human Rights said.
At least 200 more people were wounded in the attack on Douma, about 10 miles northeast of Damascus, according to the British-based Observatory and the local arm of Syrian Civil Defense, a rescue service operating in rebel areas.
The Observatory said at least 10 rockets were fired during the air strike and accused the warplanes of bombing again after rescue workers had arrived at the scene.
A Syrian military source said air force strikes on Douma and nearby Harasta targeted the headquarters of the rebel group Islam Army. The insurgent group attacked government positions in Harasta on Saturday.