The bombers were moved after suspicious activity near the base led to a counter-terrorism investigation.

The bombers were moved after suspicious activity near the base led to a counter-terrorism investigation.

Donald Trump has said there were "some threats" that led the United States to pull bombers from a UK base.

Washington confirmed earlier that the bombers had left the RAF Fairford airbase -- used by the United States to launch strikes on Tehran -- even as the British government insisted the site was safe.