Dozens of Insulate Britain activists brought traffic to a standstill during morning rush hour to press Prime Minister Boris Johnson to cut carbon emissions. This is the second time in three days that the group has blocked the road.
Hertfordshire police said officers who were called to respond to a protest at an M25 junction tried to "balance the rights of people to protest with the rights of those affected by their presence — the protesters, however, had glued themselves to the tarmac and refused to move.
The London's Metropolitan Police force assisted in the arrests. The officers said they responded as quickly as possible to what is considered to be an "unreasonable and unsafe" highway obstruction.