Police said a man sexually assaulted a woman on a Victoria line London Underground train and have released CCTV images in an effort to locate him.
The British Transport Police said the incident occurred on October 23 last year, on a northbound train from Oxford Circus to Highbury & Islington.
Images released on Friday show a man who may have information that could assist their investigation.
One picture shows the man wearing a grey t-shirt, a dark jacket, and a single-strap sports bag over one shoulder. He appears calm and relaxed as he walks along a Tube station platform.
The man has reddish hair and a bushy beard.
Anyone who recognises him is asked to contact BTP by texting 61016 or by calling 0800 40 50 40, quoting reference 529 of 23 October.
Alternatively, you can contact Crimestoppers anonymously on 0800 555 111.
