COPS have released CCTV footage after a teenage girl was sexually assaulted on the Tube.
The assault took place on board a Northern line train between Stockwell and South Wimbledon on February 19.

Detectives are looking to speak to a man in this CCTV footage[/caption]
At around 11.15pm a man made sexual remarks to a teenage girl.
He then sat next to her and sexually assaulted her, said the British Transport Police.
Other passengers intervened and the man left the service at South Wimbledon, said cops.
The BTP have now released footage of a man they believe may have information that could help their investigation.
Cops urged anyone with information or who witnessed the attack to come forward.
Anyone who recognises the man in the CCTV, or who has any other information, is asked to contact the British Transport Police 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.