Detectives are investigating a “very serious” sexual assault on a commuter at London Bridge underground station.

The 27-year-old woman was walking towards the escalators at the station's Jubilee Line entrance at 9.30pm on November 27 when she was attacked.

Police have released a CCTV image of a man they want to speak to in connection with the attack.

Detective Constable Suleman Yazdani said: “This was a very serious assault, which has left the victim extremely shaken. I am very keen to identify the man in the CCTV image as he may prove vital in our investigations.

“I would also like to appeal to members of the public who may have been in the area and may have witnessed the incident to come forward."

Anyone with information can call British Transport Police on 0800 40 50 40, or text 61016, quoting reference TSUB/B8 of 15/12/14. Information can also be passed anonymously to independent charity Crimestoppers on 0800 555 111.