Scarborough police are investigating a report of a serious sexual assault in the town.
It occurred between 3pm and 4pm on Friday October 3, in the Scalby Road area.
The incident involved a girl from a local secondary school, who was assaulted by a local boy of the same age.
The suspect was arrested shortly after 1am on Saturday October 4. He has now been released on bail to allow for further police enquiries.
The victim is receiving support from specially trained police officers.
Anyone with information should contact Scarborough CID on 101, select option 2 and ask for Rob Henderson.
Or call Crimestoppers anonymously on 0800 555111, quoting reference number 12140170807.