A Syrian rebel group claimed responsibility for the Damascus bombing that killed four of Syrian President Bashar Assad's top aides, releasing a video on Saturday purporting to show the building minutes after the blast and radio messages from panicky security forces.

The video, circulated by the "Military Leadership of Damascus City and Province" in the name of the "Hawks Special Operations Battalion" showed drifting smoke near the National Security Bureau building in the Damascus district of Abu-Rummaneh which was struck, though showed no sign of outward damage.

Rebels using the name of other groups have already claimed to have carried out the July 18 attack. But the video, downloaded onto the Internet on Saturday, was the first to show the apparent aftermath of the brazen blow against Assad's inner circle.

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