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Officers acted quickly to make 35 arrests and get traffic moving following reports of Insulate Britain protestors blocking the road in two locations in Thurrock.
Police were initially called to reports of people on the slip road of Junction 31 of the M25 shortly after 8.25am and officers were on scene within five minutes.
16 people were arrested.
One lane was kept open to allow traffic to keep moving, with all lanes re-opened shortly after.
Police were then called to reports of people blocking Stonehouse Lane, Purfleet.
Officers arrested 19 people and the road has now fully re-opened.