A man is wanted after a woman was sexually assaulted on an Elizabeth line train in east London.
British Transport Police (BTP) have said that the incident took place on May 16, as the train travelled between Stratford station and Forest Gate.
A man sat down next to a woman and sexually assaulted her, police have said.
The woman reportedly shouted at him to stop, and he hit her in the face.
Members of the public then intervened by pushing the man away, and he left the train at Forest Gate.
Police have now released images of a man they believe may have information that could help their investigation.
Anyone who recognises him is asked to contact BTP by texting 61016, or by calling 0800 40 50 40 quoting reference 727 of 16 May.
Information can also be given anonymously to Crimestoppers on 0800 555 111.
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