"The army's air defence shot down two... RQ-11 drones," Rear Admiral Amir Rastegari told state television and Fars news agency, adding that the army was carrying out "research" on the downed unmanned aircraft.

He said the first had been brought down in Shahrivar 1390 (August-September 2011) and the second in Aban 1391 (October-November 2012), but gave no details of their location.

He did not offer proof for the claim.

Iran has in the past claimed to have hunted down a number of US drones, showing detailed images of the alleged spoils.