British Transport Police (BTP) are searching for a man in connection with two separate sexual assaults on the London Underground that took place in May and July.
The first incident occurred on May 8, when a woman was sexually assaulted on a Circle line train at Liverpool Street station. On July 1, a second woman was assaulted on a Victoria Line train at Seven Sisters Tube station.
Investigators believe the incidents are related and have now released an image of a man they think could have vital information to assist their inquiries.
The BTP has urged anyone who recognises the man in the image to contact them by texting 61016 or calling 0800 40 50 40, quoting reference 612 of 1 July. For those who wish to remain anonymous, Crimestoppers can be contacted on 0800 555 111.
The investigation is ongoing, and officers are appealing to the public for any further information.