Surrey Police said that traffic has stopped in both directions of the motorway “for the safety of everyone”.
At 7:40am today, Surrey Police said of one protester who climbed on the gantry between junctions six and seven.
They said on Twitter: “Officers are on the scene and currently dealing with one protester who has climbed onto the motorway gantry at junction 6 towards 7 of the M25 this morning (7 November). Traffic is still moving at this moment.”
In a later update shortly after 8am, they added that more protesters have climbed onto gantries near junctions 8-9, one between junctions 13-12 southbound and one between junctions 13-14.
Police are urging motorists to avoid the area if possible, while protester removal teams are operating.
Last night, Metropolitan Police officers arrested three people believed that intended to cause disruption on motorways through protesting.
The force said a proactive policing operation was launched “to identify and arrest people we have strong reason to believe are intent on causing reckless and serious disruption to the public”.
Assistant Commissioner Matt Twist said: “Acting on intelligence, this operation is fast-moving and will continue this evening and overnight with multiple arrest enquiries underway. So far this evening we have made three arrests linked to this activity.
“This is an evolving situation and we suspect the intent of these individuals is disproportionate to any legitimate right to protest and clearly crosses the line into unlawful activity.
“Our investigation has strong reason to suspect the Just Stop Oil group intend to disrupt major motorway road networks which would risk serious harm to the public, with reckless action to obstruct the public on a large scale.
“All those arrested are suspected of engaging in conspiracy to cause public nuisance contrary to Section 78 Police, Crime, Sentencing and Courts Act 2022.
“There remains a possibility outstanding suspects are still intent on causing unlawful disruption to the public. The Met has mobilised specialist teams and drawn police officers from across the capital to respond.
“We are calling on the public to assist us. Remain vigilant – if you see something suspicious or witness an attempt to cause disruption call 999 immediately.
“Operations like these come at a cost. Since the start of October we have used more than 10,000 officer shifts to police Just Stop Oil protests. These are officers who would otherwise be dealing with issues that matter to local communities, such as knife crime, safeguarding and responding to burglaries.
“We are determined to bring to justice all of those who conspire to cause significant and unreasonable disruption to London, or cause damage to buildings, property or valuables. It’s what the public expects, and we’ll work closely with the Crown Prosecution Service and Courts to make sure this happens.”