Wiltshire Police are trying to locate a man who we believe may have been witness to a sexual assault in Swindon.
The incident took place at approximately 9.30pm on April 18, near Dorcan Way, to the rear of Conway Road.
The victim, a 14-year-old girl, and the suspect are known to each other and as part of Police enquiries, they have arrested a 15-year-old boy in connection with the incident.
He has since been released on conditional bail while further enquiries continue.
Det Con Jason Walsh said: “We believe a man, wearing a hi-visibility jacket, cycled past the area at the time of the incident and we are really keen to speak to him.
“If you think this may have been you, or you know who it may have been, please contact police immediately. This person could have information which could be crucial to our investigation.”
Please call 101 and quote crime reference number 54190037437.