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There were long delays on the approach to the Dartford Tunnel this afternoon following a crash.
The carriageway was blocked on the A282 Essex-bound, from the M25 Junction 2 for the Darenth Interchange and Junction 1 for Bob Dunn Way shortly after 2pm.
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Lanes two, three and four were all closed but reopened at around 3.30pm.
National Highways said the road was closed due to a police incident.
Emergency services have been approached for further details.