The incident happened on an escalator at Moorgate Underground station soon before 6pm on September 9.

Officers think the man in the picture could help with their investigation.

Anyone who recognises him is asked to contact BTP by texting 61016 or by calling 0800 40 50 40, quoting reference 693 of 9 September.

Alternatively, you can call Crimestoppers anonymously on 0800 555 111.

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