Police are searching for a sky blue, metal baseball bat they think was used in an assault in Jersey.
A 17-year-old boy has been airlifted to hospital with serious head injuries after a fight.
The boy was flown to Southampton for "urgent medical attention".
The fight between two teenage boys started on Grand Vaux Road outside Sutton Court and continued on Whitely Close yesterday afternoon (25 June), according to Jersey Police.
A 15-year-old boy, who was arrested on suspicion of Grave and Criminal Assault, has been released on police bail without charge.
It is believed that the boys knew each other and was an "isolated incident".
Police say there is no reason to believe there is a further danger to islanders.
They urgently want to speak to anyone who saw what happened between 2pm-3pm on Tuesday 25 June.