Two explosions shook Damascus today, killing 40 and wounding more than 170 ,were the deadliest to hit the capital since the revolt began.
Blasts in quick succession has rocked the Syrian capital at morning rush hour,sent cars flying across the street and created two deep craters.
State TV footage of the blasts showed massive destruction in the al-Qazzaz suburb to the south of Damascus said to house a military intelligence complex,blaming the attacks on "terrorists".
Eyewitnesses reported seeing smouldering cars and pickup trucks after the explosions and the grisly sight of medical workers collecting human remains.
The Syrian Observatory for Human Rights, a Britain-based monitoring group said at least one of the blasts was caused by a car bomb.
One Damascus resident, who gave his name as Ahmad, told the BBC,"I heard the two explosions clearly from my house. The whole of Damascus heard them. They were very, very strong - the biggest explosions I have ever heard. At first, I thought they were air strikes.
The Syrian Observatory for Human Rights, a Britain-based monitoring group, put the death toll at about 50, including civilians and security forces members, and said the target was an intelligence services base.