British Defense Secretary Wes Streeting thanked a tipster for calling in the threat to a British air base that hosts U.S. forces, though said the caller only "had a partial picture" of the situation. Read more: ↧ Tipster in RAF Fairford plot had 'partial picture,' British ministe... A police cordon remained in place on Monday near a major air base hosting U.S. forces in the southwest of England, where British police arrested five men early on Sunday.