The strikes were in retaliation for an attack against a US-led coalition base near Hasakah in northeast Syria at approximately 1:38 p.m. (1038 GMT) on Thursday, it said.

The U.S. intelligence community assessed that the drone was Iranian in origin, the military said.

U.S. Defense Secretary Lloyd Austin said the strikes targeted groups affiliated with Iran’s Islamic Revolutionary Guards Corps.

“The airstrikes were conducted in response to today’s attack as well as a series of recent attacks against Coalition forces in Syria by groups affiliated with the IRGC,” Austin said in a statement.