M25 traffic chaos after security alert closes Dartford Crossing
6 September 2013 Last updated at 22:26 BST
Drivers have been stuck in huge queues after the M25 Dartford Crossing between Kent and Essex was closed in both directions because of a security alert.
Police ordered the closure when a pedestrian was arrested after being spotted behaving unusually, at about 16:00 BST.
The Queen Elizabeth II Bridge was shut at 17:00 BST, with both tunnels shut 20 minutes later.
Kent Police said officers found a suspicious item, forcing the closures.
At about 23:00 BST police said they had begun the process of reopening Dartford Crossing and confirmed that the item found does not pose a threat.
Ben Geoghegan reports.