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.
The 51-year-old victim suffered multiple stab wounds and was pronounced dead in the carriage.
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Detectives continue to search for the murder suspect, who has been described as a black man in his 20s or 30s, of slim build with a beard, about six feet tall, and dressed all in black with white trainers.
