Drivers are facing long delays after a crash on the M25.
One lane is closed on the motorway between junction 27 for the M11 and junction 28 for the A12 and Brook Street.
A spokesman for the ambulance service said: "We were called at 1.04pm with reports of a collision on the M25.
"We sent one rapid response vehicle, which is still at the scene."
Essex Police was contacted for comment.
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