A U.S. defense official with knowledge of the strikes told Fox News that US Air Force F-15s and F-16s were used in the operation. The strikes took place at approximately 6 p.m. Eastern Time, or 1 a.m. local time.

At least one facility used by Iran’s militia forces to launch and recover drones was destroyed, the official added. Recent strikes by the crude drones have targeted Americans in Baghdad and Erbil in northern Iraq.

The official said he does not expect “a lot of casualties” from the Iranian-backed forces because of the time of the strike.

All U.S. jets returned to base without a problem, the official added.

Sunday’s airstrikes are the latest operation carried out against Iranian-backed military groups, following President Biden’s first known military action in February, when an airstrike targeted a compound in Syria operated by Kait’ib Hezbollah and Kait’ib Sayyid al Shuhada.