Do you recognise this man?
Detectives investigating a sexual assault on board a Northern line train between Kentish Town and Highgate have released this image in connection.
On Wednesday 30 April at around 5.40pm a man stood close to a woman on board the train before sexually assaulting her.
Detectives would like to speak to the man in the image as they believe he may have information that could help with their investigation.
Anyone who recognises him is asked to contact BTP by texting 61016, or by calling 0800 40 50 40 quoting reference 369 of 1 May.
Information can also be given anonymously to Crimestoppers on 0800 555 111.