A man has been decapitated after sticking his head out of a train window.

The Gatwick Express passenger died instantly after the incident at Wandsworth Common station at just after 5.30pm on Sunday.

A London Ambulance Service spokesperson told ITV News: "We were called to reports of a man hit by a train with severe head injuries.

"Sadly he was pronounced dead at the scene by doctors."

A British Transport spokesman told ITV News the incident happened on a Gatwick Express service on its way to London's Victoria station.

He added: "We were called to Wandsworth Common railway station on Sunday at 5.32pm.

"A man was pronounced dead at the scene.

"The incident is being treated as non-suspicious and a file will be prepared for the coroner."