British Prime Minister Andy Burnham has accused Iran's Islamic Revolutionary Guard Corps (IRGC) of planning a suspected attack against RAF Fairford in Gloucestershire, a British military base used by US bombers for strikes against Iran.
The charges followed the arrest of seven men, including a dual British-Iranian citizen, and the withdrawal of 12 American B-1 bombers from the base.
US officials told Reuters that intelligence pointed to a possible Iranian-backed operation involving a complex drone strike against the facility.
President Donald Trump later confirmed that an Iran-related threat had prompted the withdrawal of US bombers from RFF Fairford.
The director general of MI5, Ken McCallum, warned that Iran is increasingly trying to hit heavily defended targets, including military installations, and described the Fairford incident as "not unique. ".
McCallum also revealed that more than 50 arrests related to Iranian threats had been made in Britain over the past year.