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The B-52 bombers ordered by the White House to deploy to the Persian Gulf to counter unspecified threats from Iran are beginning to arrive at a major American air base in Qatar.

Images released by the U.S. Air Force show B-52H Stratofortress bombers arriving at Al Udeid Air Base in Qatar on Thursday. Others landed at an undisclosed location Wednesday.

The Air Force identified the aircraft as coming from the 20th Bomb Squadron of Barksdale Air Force Base in Louisiana.

On Sunday, the White House announced it would send the USS Abraham Lincoln aircraft carrier strike group and the bombers to counter Tehran.

On Wednesday, Iran announced it would begin backing away from its nuclear deal with world powers, a year after President Donald Trump pulled America from the accord.