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Officers from British Transport Police are appealing for information after a man exposed himself and masturbated on board a train.
Police said the incident took place on Thursday, March 20, on board a 10pm train travelling from Bristol Temple Meads to London Paddington.
A man moved seats to sit opposite the victim before proceeding to masturbate and expose himself while looking at her and smiling, police said.
It is believed the man in the image may have information that will help officers with their investigation.
Anyone who recognises this man or has any information about the incident has been asked to contact officers by texting 61016, or by calling 0800 40 50 40 quoting reference 529 of 21 March.
Alternatively, you can call Crimestoppers anonymously on 0800 555 111.