Northumberland County Council has said it is supporting staff and pupils at Queen Elizabeth High School after the death of 15-year-old student Holly Newton.
Holly, from Haltwhistle, suffered fatal injuries and died in hospital following an incident on Priestpopple in Hexham on Friday night.
A teenage boy also suffered serious injuries in the incident. A 16-year-old boy has been charged with murder, attempted murder and possessing a knife and is currently remanded into youth detention accommodation after appearing at Newcastle Crown Court this week.