The Damascus blast killed four senior defense officials, namely Syria’s

Defense Minister Dawoud Rajha, his deputy, President Assad’s brother-in-law, ex-Defense Minister Hassan al Turkmani and Interior Minister Mohammad al-Shaar.

A suicide bomber attacked the National Security building during a meeting between the ministers and security officials on UN peacekeepers in Syria.

The Free Syrian Army and the Liwa al Islam radicals claimed responsibility for the attack.

TASS, RIA