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Emergency services are at the scene of a crash on the M25.
The incident happened on the anti-clockwise carriageway, between J25 Enfield and J24 at Potters Bar.
Highways England says all lanes are now open, but motorists are warned to expect delays of about 15 minutes.
Drivers are also warned to expect delays on the anti-clockwise stretch between J2 and the Dartford Tunnel, due to high volumes of traffic.
The police and ambulance services have been approached for more information.
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