Seeking to retaliate against a U.S. drone strike killing its top military commander, Iran’s elite Islamic Revolutionary Guards Corps (IRGC) fired multiple missiles at two U.S. military bases in Iraq early on Wednesday.

The U.S. Central Command admitted that 15 missiles had been fired at two targets, 10 of which struck the Ain al-Assad airbase and one Erbil, while four others failed. It denied reports of any casualties.

The strikes came in the wake of the killing of General Qassem Soleimani, who headed the Islamic Revolutionary Guards Corps’ (IRGC) Quds Force, and his close aides including the deputy

Read more: Tensions soar as Iran strikes US targets in Iraq