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Drivers have been caught in nine mile tailbacks, while it is not yet known when the road will be reopened.

Photographs posted on social networking site Twitter showed long queues of stationary traffic with some commuters standing outside their vehicles.

Some motorists reported seeing a ‘foreign’ man shouting and behaving suspiciously around the toll booths at the Dartford Crossing on the M25.

It is thought he may have been on a coach and had got off at the toll.