A female worker was sexually assaulted by a man at Liverpool Lime Street Station, police have said.
Police have released CCTV images of a man they want to speak to following the incident on Saturday, September 12.
The member of staff was near the station's exit on Lord Nelson Street when she was approached by a man at 6.10pm.
The man touched her upper arm as he began talking to her, police said.
She waved away his attention and the man left.
But he returned a short time later and sexually assaulted the staff member, before leaving the station.
British Transport Police believe the man in the CCTV images may have information which could assist their investigation.
In the photos the man can be seen wearing a khaki green t-shirt, blue jeans and wearing a backpack.
Anyone who recognises him or has any information that could assist with the investigation is asked to contact the British Transport Police.
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A spokesperson from the force said: "Do you recognise this man?
"Officers investigating a sexual offence at Liverpool Lime Street station are today releasing images in connection.
"At 6.10pm on Saturday 12 September, a man approached a member of staff near the station’s Lord Nelson Street exit and touched her upper arm as he began talking to her.
"The woman waved away the attention of the man, and he left.
"A short time later, the man returned and sexually assaulted the member of station staff before leaving the Merseyside station."
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They added: "Officers believe the man in the CCTV images may have information which could assist their investigation.
"If you recognise him or have any information, please contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 2000062333.
"Alternatively, you can call Crimestoppers anonymously on 0800 555 111."
