Detectives investigating a sexual assault on board a Metropolitan line train have today released these images in connection.

At around 8:15am on Thursday 5 December, a teenage girl was sexually assaulted by a man on board train from Finchley Road to Baker Street. The victim then boarded another train from Baker Street to King’s Cross where the same man sexually assaulted her again.

Officers believe the man in the images may have information which 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 469 of 5 December.

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