WASHINGTON (AP) — Iran retaliated Monday for the U.S. attacks on its nuclear sites by targeting Al Udeid Air Base, a sprawling desert facility in Qatar that serves as a main regional military hub for American forces. A U.S. defense official says no casualties have been reported.

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

NEW YORK -- US President Donald Trump on Monday confirmed that Iran had launched a missile attack on a US military base in Qatar in response to recent American airstrikes on its nuclear facilities, describing it as a "very weak response" that caused no casualties and "hardly any damage."