A man has been murdered in front of horrified passengers on board a train in Surrey.
The victim was stabbed to death on the 12:58 Guildford to London Waterloo service, British Transport Police (BTP) said.
An eyewitness told the BBC he had been involved in a “vicious fight” on the train beforehand. His attacker then fled and is being hunted.
The train is currently being held at Horsley railway station.
Emergency crews remain at the scene, in the village of East Horsley and police teams are searching the surrounding area for the suspect. No arrests have been made.
A BTP spokesman said the victim suffered a fatal stab wound.
Det Supt Gary Richardson said it was a “shocking and violent attack which took place on board a train in broad daylight”.
He said it was an “incredibly frightening” incident for passengers on the train.
Police believe the suspect and victim boarded the train at London Road (Guildford) at 13:01 GMT.
It is understood the offender then left the train at Clandon railway station, police said.
Timetable information for the train shows it left Clandon at 13:06 – five minutes after the pair boarded the service.
Police said a number of officers were now in the Clandon area trying to find the man responsible.
“We would encourage anyone who was on this train to come forward, regardless of whether or not they think they can help,” Det Supt Richardson said.