All traffic is being temporarily held and there are huge queues due to accident on M25 clockwise at Junction 2.
Kent Police and Kent Fire & Rescue Services have rushed to the scene. A diversion has been put in place and there are delays of 90 minutes.
National Highways said: “There are severe delays, congestion is back to between the M25 J29 and J30 (clockwise).
“If this closure impacts on your planned route, please allow extra journey time. Plan ahead, you may wish to re-route or even delay your journey.”
New UpdatesView PostToday19:20 BST
Live traffic cameras show cars trapped in bumper-to-bumper traffic on the M25 in Kent this evening.
Drivers are facing 90-minute long delays(Image: Highways England)
National Highways has reported delays of around 90 minutes with seven miles of congestion on the approach.