The British police said Wednesday that they had arrested a Sudanese man carrying five bullets after he arrived at Heathrow Airport on a flight from Dulles International Airport, which serves the Washington area. The 45-year-old man, who was not identified further, was initially charged with violating a firearms statute, but he was later held and questioned under Britain’s antiterrorism laws, officials said. There was no immediate explanation from the British or American authorities about how airport screening procedures at Dulles failed to detect the ammunition the man was said to have been carrying when he boarded a Virgin Atlantic flight, No. 022. Full Story