A 15-year-old boy is in a critical condition after suffering serious head injuries in an assault at a party in Swainby.
Detectives are appealing for witnesses and information after the assault occurred yesterday evening.
A North Yorkshire Police spokesperson said: "The boy sustained serious head injuries and was taken to hospital where he remains in a critical condition.
"Officers would like to hear from anyone who was at the party at the time or has any other information to get in touch."
Witnesses or anyone with information that could assist the investigation, are urged to contact North Yorkshire Police on 101, select option one, and speak to the Force Control Room.
Calls can be made anonymously to Crimestoppers on 0800 555 111.
Quote reference 12170114780 when passing on information.