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Drivers are facing long waits on the approach to the Dartford Crossing.
Long queues are forming on the tunnel approach anticlockwise from Junction 1A A206 in Dartford to Junction 31 A1306 at Lakeside shopping centre, Essex.
Traffic monitoring tool Inrix is reporting this is due to an accident but this has not yet been confirmed.
There is congestion back to Junction 2 at the Darenth Interchange.
Emergency services have been contacted for more information.