COPS have released CCTV footage after a teenage girl was sexually assaulted on the London Underground.
The assault took place on board a Northern line train between Stockwell and South Wimbledon on February 19.
At around 11.15pm a man made sexual remarks to a teenage girl.
He then sat next to her and sexually assaulted her, the British Transport Police have said.
Other passengers intervened and the man left the service at South Wimbledon, said cops.
The BTP have now released CCTV images of a man they believe may have information that could help its investigation.
Cops also urged anyone who witnessed the attack to come forward and contact them by texting 61016.
You can also call 0800 40 50 40 quoting reference 20 of 19 February.
Alternatively, you can call Crimestoppers, anonymously, on 0800 555 111.