UK police arrest suspect in fatal train stabbing

British police have arrested a suspect in the fatal stabbing of a man in front of his 14-year-old son on a suburban London train.

The 51-year-old man was killed Friday afternoon onboard a train traveling from the town of Guildford to London Waterloo station.

Chief Inspector Sam Blackburn said the attack was "not believed to be a random assault." He said the two men appeared to have been involved in an argument that escalated in the moments leading up to the killing.

The suspect was detained early Saturday on suspicion of murder. A 27-year-old woman was also arrested on suspicion of assisting the murder. Police said no one else was being sought in connection with the killing.

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