Police have released an image of a man wanted in connection with a serious public order offence on the London Underground.
The incident occurred on July 20 at around 3.30am on a Northern Line train between Charing Cross and Tottenham Court Road stations.
A passenger reportedly performed a sex act on himself during the journey.
Detectives believe the man in the image may have crucial information to aid their investigation.
Anyone with information is urged to contact British Transport Police by texting 61016 or calling 0800 40 50 40, quoting reference 334 of 20/07/24.
Alternatively, anonymous tips can be given to Crimestoppers on 0800 555 111.