A runaway train went through six stops on a 13-minute journey on London's Tube with other trains having to be cleared out of its path.

The engineering train became uncoupled as it was towed on the Northern Line near Archway station on Friday morning.

Passenger trains were diverted to another branch of the Northern Line while trains were cleared from the Charing Cross branch.

The train ran for nearly four miles before it stopped at Warren Street.

It came to a rest only because there is a slight incline at the station.