Detectives have released a CCTV image of a man they wish to speak to in connection with a sexual assault on board a London Underground train.

A woman was sexually assaulted on September 29 at around 8.05am after boarding a Central line service at Mile End station.

She was assaulted by a man who boarded at the same time.

The man then got off the train at Bethnal Green station before re-boarding at the next set of doors.

Detectives at the British Transport Police would like to speak to the man pictured as they believe he may have information which could help their ongoing investigation.

Anyone who recognises him is asked to contact British Transport Police by texting 61016 or by calling 0800 40 50 40, quoting reference 2600131129 of 29 September.

Information can also be given anonymously to Crimestoppers on 0800 555 111.