But an online news website said that two suicide car bombs ripped through a checkpoint and the branch of military security in that area, adding that the second car was rigged with two tons of explosives.
The activists' network, Local Coordination Committees also confirmed the rebels Free Syrian Army blasted the military security branch in Sa'sa area and attacked a checkpoint there as well.
The deadly twin blast was not the only one that rattled the capital overnight, as an explosive device went off in al-Qaimaria area in the old quarter of Damascus, injuring two people, according to local media reports.
Also on Thursday, bomb squads defused an improvised explosive device planted near a park in the Christian-dominated Bab Touma area of Damascus, reports said.
On the opposition side, the Britain-based Syrian Observatory for Human Rights said an explosion rocked the Damascus' district of Barzeh late on Thursday.
The group gave no details on human losses but said the blast was caused by an explosive device that ripped through a parked Mercedes in that area.
It was not immediately clear what the target of the explosion was.
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