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The Dartford Bridge was shut temporarily while police responded to an incident involving a broken down vehicle.
Officers were called to attend the QE2 Bridge which was closed between junctions 31A and 1A heading from Essex towards Kent.
A diversion route was put place while Essex Police attended.
As of 7.30am all lanes have since reopened and there are no reports of delays.
A spokesperson for Essex Police said: "We were called to the Queen Elizabeth Bridge just before 6.30am today.
"Two lanes were closed whilst a vehicle was recovered.
"The bridge was reopened shortly after."