Israel appears to have been behind drone strike on Iranian factory -US official 

DUBAI/WASHINGTON (Reuters) -Israel appears to have been behind an overnight drone attack on a military factory in Iran, a U.S. official said on Sunday.

Iran claimed to have intercepted drones that struck a military industry target near the central city of Isfahan, and said there were no casualties or serious damage.

The extent of damage could not be independently ascertained. Iranian state media released footage showing a flash in the sky and emergency vehicles at the scene.

A spokesperson for the Israeli military declined to comment. Arch-foe Israel has long said it is willing to strike Iranian targets if diplomacy fails to curb Tehran's nuclear or missile programmes, but it has a policy of withholding comment on specific incidents.

Pentagon spokesperson Brigadier General Patrick Ryder said no U.S. military forces were involved in strikes in Iran, but declined to comment further. 

That U.S. officials were pointing to an Israeli role in the attack was first reported by the Wall Street Journal, citing several unidentified sources. One U.S. official, speaking on condition of anonymity, told Reuters it did appear that Israel was involved. Several other U.S. officials declined to comment, beyond saying that Washington played no role.Tehran did not formally ascribe blame for what Foreign Minister Hossein Amirabdollahian called a "cowardly" attack aimed at creating "insecurity" in Iran. But state TV broadcast comments by a lawmaker, Hossein Mirzaie, saying there was "strong speculation" Israel was behind it.