Detectives investigating a sexual assault on board a Northern Line service between Stockwell and South Wimbledon are today releasing these images in connection.

At around 11.15pm on Wednesday, the 19th of February, a man made sexual remarks to a teenage girl before sitting next to her and sexually assaulting her.

Other passengers intervened and the man left the service at South Wimbledon.

Officers believe the man in the CCTV images may have information that could help their investigation.

Anyone who recognises the man in the CCTV, or has any other information, is asked to contact British Transport Police by texting 61016 or by calling 0800 40 50 40 quoting reference 20 of 19 February.

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