Police shut a major road bridge crossing the River Thames near London on Friday after arresting a man acting "unusually" and locating a suspicious item.Kent Police said they had been called to the Dartford Crossing, which carries traffic on the M25 London orbital motorway to the east of the British capital, after reports a pedestrian was behaving strangely."The male has been arrested. Officers have located a suspicious item and have closed the crossing whilst enquiries continue," police said in a statement.
