A teenage girl was sexually assaulted at York Station.
It happened when the 15-year-old girl was walking through the underpass at the station, just after midnight on Saturday 29 March.
A man approached her and spoke to her, before sexually assaulting her.
Now an image has been released of a man police want to trace in connection with the incident.
A British Transport Police spokesperson said: “Officers believe the man in the image may have information that could help their investigation.”
Anyone who recognises him, or has any other information, is asked to contact British Transport Police by texting 61016 or by calling 0800 40 50 40, quoting reference 2500037655.
Alternatively, you can call Crimestoppers anonymously on 0800 555 111 or via the website.