UK PM says Iran ‘almost certainly’ behind attack on RAF Fairford airbase. UK PM Andy Burnham said Iran was “almost certainly” behind the attack on RAF Fairford airbase, which houses US military personnel and assets. Five British men were arrested near the base in early hours of September 27. Two others, including a British-Iranian national, were also arrested but later released. “We will not tolerate these threats on our soil,” Burnham said.