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Traffic is queuing after one of the Dartford Tunnels was shut.
Congestion stretches back to junction 2 for the A2 Darenth Interchange after the right-hand tunnel was closed due to a vehicle breaking down.
It has since been reopened.
Police confirmed they were called at 9.26am to a report of a vehicle having broken down inside a tunnel at Dartford Crossing. Officers attended and the vehicle was recovered.