Police in southern England have arrested five men on suspicion of terrorism, after they allegedly approached a military base carrying explosives. The men were arrested after a farmer called police to report three vans blocking her driveway near the Royal Air Force’s Fairford base and “a large group of hooded and masked men” who ran away when she spotted them. Dozens of people were evacuated from nearby homes as a bomb squad deployed robots to search the vehicles. In a statement, counterterrorism police said all five men are British nationals in their twenties and from London. It’s not clear whether others were involved in a plot to attack the base, and a motive remains unknown. The U.K. has allowed U.S. bombers to launch long-range strikes on Iran from RAF Fairford since March 1, a day after President Trump ordered the U.S. to join Israel in its war on Iran.