The US Air Force released images of B-52 Stratofortress bombers landing in Qatar. The deployment is part of a larger US military build-up in the region touted as a countermeasure to an unspecified threat from Iran.

“The regime in Tehran should understand that any attacks by them or their proxies of any identity against US interests or citizens will be answered with a swift and decisive US response,” Pompeo wrote in a statement warning that Iran should not mistake US “restraint” for a “lack of resolve,” and criticizing Iran for “an escalating series of threatening actions and statements in recent weeks.”