The man was assaulted at the ticket barrier at Chesham station on the Metropolitan line at around 10.30pm on August 24.

He was left with a broken knuckle and cuts and bruises to his face.

Officers have released pictures of three men they think could help their investigation into the incident.

Anyone who recognises them is asked to contact BTP by texting 61016 or by calling 0800 40 50 40, quoting reference 813 of August 24.

You can also contact Crimestoppers anonymously on 0800 555 111.

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