A woman was grabbed by the neck and sexually assaulted by a man at a busy London train station.

A man approached the woman at London Bridge Underground station just after midnight on Wednesday, July 16.

He then allegedly grabbed the woman by the neck and sexually assaulted her, police said.

British Transport Police has released an image of a man in connection with the sexual assault.

Detectives said the man pictured may have information which could help their investigation.