BTP officers investigating a report of indecent exposure on board a train in Merseyside are today releasing CCTV images.
The incident happened between 7.45pm and 8.45pm on Friday 22 March between Wrexham and Bidston stations.
A man is reported to have exposed himself before touching himself inappropriately.
He left the train at Bidston and boarded a service to Liverpool.
Officers believe the man in the images may have information that could help their investigation.
Anyone who knows the man is asked to contact BTP by texting 61016 or by calling 0800 40 50 40 and quoting reference 1900023466.
Alternatively, call Crimestoppers anonymously on 0800 555 111.
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