A person has been arrested for causing a public nuisance after a lorry crashed on the M25 while Just Stop Oil protests were taking place.
A police officer was struck and injured by the vehicle after a rolling roadblock was put in place due to a person being in the road.
Essex Police said the incident, which happened on Wednesday morning, has led to road closures between J26 and J27 clockwise.
The force has not confirmed whether it was the result of activists who have been demonstrating in the area, and the cause of the accident is unclear.
It said: “We’re currently responding to an incident and a subsequent lorry collision on the M25.”
Just Stop Oil protests also took place on the M25 on Monday and Tuesday Just Stop Oil
Officers were also at J30 of the M25, where one Just Stop Oil protester had climbed a gantry, while one person was stopped.
Police warned the action would cause disruption to traffic in the area.
Meanwhile, Surrey Police confirmed one protester was on a gantry near junction 8 on the motorway.
The force said: “Officers are proactively patrolling the rest of the M25, as they have been all week.”
The Metropolitan Police said on Twitter: “We’re ready to respond to any protest activity on #M25 with partner forces again today.
“We know this disruption is incredibly frustrating for the public.
“We will act as swiftly as possible to remove any individuals intent on obstructing the road and get traffic moving again.”
Just Stop Oil staged 32 days of disruption from the end of September and throughout October, which the Met said resulted in 677 arrests with 111 people charged, and officers working a total of 9,438 additional shifts.
According to Just Stop Oil, its supporters have been arrested nearly 2,000 times since its campaign began on April 1, and five are currently in prison.
A lorry crashed on the M25 while Just Stop Oil protests were taking place Essex Police