Just Stop Oil protesters have climbed onto a major bridge that links Essex and Kent, causing five miles of queues during rush hour and affecting the M25.
Essex Police said the 275ft Queen Elizabeth II Bridge at the Dartford Crossing is closed to traffic after the report was made shortly before 3.50am this morning.
The climate change protest group, currently staging a month of disruptive protests across the capital and surrounding areas, has claimed responsibility for the stunt.
