**A man who was stabbed to death on a train in Surrey was with his 14-year-old son at the time, police have said.**
A manhunt is under way for the 51-year-old victim's killer, who fled from the train after the stabbing during a "vicious fight" on board the London-bound service.
The victim and the attacker had both boarded the train at the same station.
British Transport Police say they do not believe the pair were known to each other.
Supt Paul Langley said the teenager would have seen the killing.
"This would have been an horrific and hugely traumatic event to have witnessed and we are providing him with as much support as possible," he said.
Early indications suggested the boy's father received multiple stab wounds in the attack.
The offender is described as black, in his 20s or 30s, with a slim build and a beard, dressed all in black with white trainers.
People have been urged not to approach him but to call 999.
Police have said the suspect and victim had got on the train at London Road (Guildford) at 13:01 GMT and the offender left the service at Clandon, five minutes later. Officers boarded the train at the next stop, Horsley.
Describing the attack as "violent and deadly", Supt Langley said there had been a number of sightings of the suspect, who fled towards Dedswell Drive.
He said officers were in the area looking for the killer and BTP was working closely with Surrey Police and the National Police Air Service.
An eyewitness to the killing told there had been a "vicious fight" on the train.
**UK24News**
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