An air raid south of Damascus on Thursday killed at least 11 civilians, among them seven children, said the Syrian Observatory for Human Rights.
"Seven girls, three women and a man were killed in the air strike," said Observatory director Rami Abdel Rahman, updating an earlier toll of 10.
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Warplanes fired three missiles on the western district of Husseiniyeh, an area in Damascus province which is home to Palestinian refugees and Syrians displaced from the Israeli-occupied Golan Heights region, said the Observatory.
Fierce clashes between troops and insurgents broke out Wednesday night on the outskirts of the rebel-held area, Abdel Rahman said.
Amateur video posted by activists on the Internet and distributed by the Observatory showed a group of men pulling from the rubble the corpse of a decapitated man.