RIYADH – An explosion was heard in Saudi Arabia’s capital Riyadh onTuesday and the cause was not immediately known.

Several witnesses also reported hearing two loud bangs and seeing a smallplume of smoke above the capital just before 1 PM local time (10 A.M. GMT).

Saudi-owned Al Arabiya TV cited local reports of an explosion and videoscirculating on social media purporting to show a missile being interceptedover Riyadh.

There was no immediate comment from Saudi authorities, or any claim ofresponsibility.