Sky News says it's an Iranian ammunition depot where Shia militias operate.
Unconfirmed reports hopefully claiming it was a chemical weapons plant used by Assad regime.
Syrian Observatory for Human Rights says it was likely an Israeli missile strike, cites "official in the regional alliance backing Damascus" who agrees Israeli missiles from across the Golan Heights did it.
Al Jazeera says the attacks seem to have been targeting an arms depot and weapons research center near Jamraya. They say Syria's anti-aircraft system shot down a few missiles--
Jerusalem Post cites "an official in the regional alliance," who says the blasts were caused by missile strikes targeting the base and by Syrian air defense systems responding.
Israel has no comment.