Explosion occurred in Qasion mountaintop in Syria's Damascus ( video )

An explosion struck the capital city of Damascus, afternoon, on the mountaintop of Qasion where the Syrian Army fires artillery towards eastern Ghouta areas.
Military source denied any terrorists’ shelling or air strikes on Qasion, adding that no any injures or dead among the soldiers.
The source made it clear when he said that “the reason of the explosion is a technical failure in the artillery, due to bad shells”
Mount Qasioun, (Jabal Qāsiyūn) is a mountain overlooking the city of Damascus and has been heavily entrenched with Syrian government forces since the start of the Syrian War, as it is a strategic site in the battle for the outskirts of Damascus.