Officers are hunting for a couple alleged to have engaged in an indecent sexual act at a Paisley train station.
The incident took place at about 4pm on Friday June 25 at Paisley Gilmour Street station.
It is alleged that a man and woman took part in an indecent sex act in front of a member of public on platform four at the site.
The British Transport Police are investigating the report and have released descriptions of the man and woman they want to speak to in relation to the incident.
Cops described the man as being of slim build, with blue eyes and star tattoos on his neck.
He was wearing a black Under Armour cap, with a black hoody, trousers and trainers.
The woman is described as being of slim build and was wearing a black cap with a pink jacket, black leggings and white trainers.
Officers are keen to speak to anyone who may have witnessed the incident to help with their investigation.
Witnesses or anyone with information can contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 395 of June 25th.
Alternatively, you can contact Crimestoppers anonymously on 0800 555 111.