Police are searching for a murder suspect after a man was stabbed to death on a train in Surrey.
Emergency services were called to Horsley station at 1.15pm.
The victim suffered a “fatal stab wound” and died at the scene, police said, despite the “best effort” of officers and paramedics.
A murder inquiry is underway.
Officers are now in the Clandon area, attempting to “identify and trace the man responsible for this assault”.
There have been no arrests so far.
The train was travelling between Guildford and London Waterloo.
“We know that this was an incredibly frightening incident for passengers travelling on the train,” said Detective Superintendent Gary Richardson from British Transport Police.
Anyone who sees someone they think may be the suspect is advised to call 999 immediately.