Iran retaliated Monday for the U.S. attacks on its nuclear sites by targeting Al Udeid airbase, a sprawling desert facility in Qatar that serves as a main regional military hub for American forces.

Iran launched missiles at a US military base in Qatar on Monday, in what it said was retaliation for American strikes against its nuclear sites over the weekend. Witnesses reported hearing loud bangs in the sky above the capital, Doha, while videos showed bright flashes in the sky as air defence systems attempted to intercept missiles.

Qatar issued a statement condemning the Iranian attack and said no casualties were reported. Iran said Monday night that it attacked American forces stationed at Qatar’s Al Udeid Air Base. Trump visited the base and addressed US and Qatari troops there in May during a trip to the region.