Two groups claimed responsibility for the explosion in Damascus On Wednesday that killed several top Syrian officials, including the defence minister and the president's brother-in-law.
Liwa al-Islam, an Islamist rebel group whose name means "The Brigade of Islam", said in a statement on its Facebook page that it "targeted the cell called the crisis control room in the capital of Damascus."
A spokesman for the group confirmed the claim by telephone.
The Free Syrian Army also claimed responsibility for the attack, according to spokesman Qassim Saadedine. "This is the volcano we talked about, we have just started," he said.