A U.S. coalition spokesman has reported that Iraq’s Ain al-Asad air base, which hosts U.S. and other international forces, was attacked with a rocket on Monday, but there were no reports of casualties.

Initial reports suggested the attack occurred at 1:35 p.m. (1035 GMT), U.S. Army Colonel Wayne Marotto, spokesman for the U.S.-led international military coalition, wrote on Twitter.

Marotto noted that the damage was being assessed.

Washington accuses Tehran-backed militia groups of launching regular rocket attacks against its troops in Iraq. There was no immediate claim of responsibility for Monday’s attack.