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The left hand tunnel at the Dartford Crossing has been closed following a crash.
Emergency crews were called following a collision involving a car and a van on the anticlockwise carriageway of the M25 at 11.40am.
Congestion was reported tailing back to Junction 2 of the motorway at the A2 Darenth Interchange.
The road was reopened at around 12.20am, but traffic is still queuing due to the incident.
No serious injuries were reported.