Iran retaliated against the U.S. on Monday, launching missiles at a U.S. base in Qatar, according to a statement from the Qatar foreign ministry. The missiles targeted Al-Ubaid Air Base outside Doha and were intercepted by air defenses before they could strike the base, the Qatari government said.

The Pentagon already had begun taking measures to strengthen its firepower in the Middle East and protect U.S. bases there.

Iran carried out a missile attack on the United States’ Al Udeid Air Base in Qatar on Monday, according to a U.S. official, two days after the U.S. struck three nuclear sites in Iran. There are no reports of casualties at the base,