Detectives investigating a sexual assault on a train at Darlington railway station have released this image in connection.
Just after 5.30pm on Saturday 18 July, a man was sexually assaulted as another man exited the train.
Detectives would like to speak to the man pictured, as they believe he may have information that could assist their investigation.
Anyone who recognises him is asked to text BTP on 61016 or call 0800 40 50 40, quoting reference 587 of 18 July.
Information can be given anonymously to Crimestoppers on 0800 555 111.
