An air ambulance attended the scene
There is queueing traffic on the M25 due to a serious crash near the Dartford Crossing.
An air ambulance attended the scene between junction 29 and 30 and police are investigating the collision.
One lane has been opened to allow traffic to pass the scene but severe congestion remains in place.
Drivers are being advised to allow more time for their journey.
Essex Police said one person has been seriously injured in a two vehicle crash.
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