Officials on Monday confirmed a counterterrorism investigation is underway in Great Britain, in connection with five men who were arrested on charges of alleged suspicious activity near a military base used by the United States. 

President Donald Trump has indicated that the arrests occurred after authorities in the U.S. worked with Britain “for a long time” to target suspects accused of traveling to RAF Fairford to carry out a terrorist attack. RAF Fairford is about 100 miles west of London and is one of several bases in Britain that have been used by the U.S. Air Force.