A police officer has been seriously injured after a collision with a motorbike.
The motorbike was being “driven the wrong way” along the M25, near Junction 3 for Swanley, according to a Kent Police statement on Twitter.
The male officer had to be airlifted to hospital for treatment.
The collision happened just after 4pm on Sunday.
Police added a man “has been arrested in connection with the incident”.
Both carriageways were reopened to traffic later on Sunday evening.