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Also Sunday, government troops shelled residential areas in central Syria.

The shelling hit neighborhoods in the central city of Hama and the rebel-held town of Rastan north of Homs, the Local Coordination Committees and the Britain-based Syrian Observatory for Human Rights said.

The two groups also reported clashes between troops and rebels in Hama, in the Damascus suburb of Harasta and in the capital’s central Midan district. They said a bomb struck a security vehicle in the capital’s upscale district of Mazzeh — near a military airport, according to the LCC.

The Observatory said the vehicle bombing caused casualties, but the group did not have other details on the dead or wounded from the day’s violence.

A video posted online by activists showed thick black smoke billowing from what it said was Mazzeh.

Damascus is tightly controlled by regime forces but has been hit by a wave of blasts over recent months that claimed the lives of scores of people. Most of the blasts have targeted Syrian security agencies.

Bassem Mroue reported from Beirut. Associated Press writer Adam Schreck contributed to this report from Dubai, United Arab Emirates.