Dartford Crossing
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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.