A police officer has been airlifted to hospital after a crash involving a motorbike being driven the wrong way along the M25.
Kent Police said patrols were responding to a report of a stolen motorcycle when the collision happened near Junction 3 at about 16:05 GMT.
The male officer suffered serious injuries after being hit by the bike along the clockwise carriageway.
A man, 26, was arrested on suspicion of offences including dangerous driving.
The M25 was closed in both directions near Junction 3 for Swanley after the crash.
Both carriageways have since reopened but police warned drivers to expect delays.
The male officer suffered serious injuries after being hit by the bike along the clockwise carriageway.
A man, 26, was arrested on suspicion of offences including dangerous driving.
The M25 was closed in both directions near Junction 3 for Swanley after the crash.
Both carriageways have since reopened but police warned drivers to expect delays.