Eleven people have been arrested after climate protestors blocked parts of the M25.
Police warned motorists to avoid parts of the motorway after demonstrates sat on the roads during rush hour.
Protestors for Insulate Britain have blocked the slip roads at a number of junctions – including junction 6 in Godstone, junction 14 for Heathrow and junction 31 for Lakeside.
Junctions 20 and 3 have also reportedly been affected.
Essex Police said it was called just before 8.15am and 11 people were arrested on suspicion of highways obstruction and are currently in custody.
Chief Inspector Paul Austin said: "This incident caused significant disruption and our officers worked to resolve it as quickly and safely as possible.
"I want to thank the drivers affected for their patience and understanding."
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One motorist told Sky News there were around 2.5 miles of queueing clockwise on the M25 at junction 14 this morning.
Surrey Police tweeted: "We're currently overseeing a protest at J6 M25 reported just before 8am
"[A number] of protesters from Insulate Britain are at the location, slip road closed+diversion being set up. No arrests made at this stage. Pls avoid the area for the time being."
Footage shared on social media showed angry drivers attempting to drag the protestors from the road.
Video also showed protestors moving out the way to allow an ambulance to pass through.
Insulate Britain is a campaign group launched by members of Extinction Rebellion who want the government to reduce home heating emissions to zero.
The protest group said today's disruption was "just the start", adding: "Actions will continue until the government makes a meaningful commitment to insulate Britain's 29 million leaky homes, some of the oldest and most inefficient in Europe".