A 15-year-old boy was stabbed to death in West Norwood, south London, the Metropolitan Police have said.
The teenager suffered multiple injuries in the incident at Park Campus School in West Norwood, south London. Emergency services rushed to the scene shortly before 9am and took the boy to hospital, where he was pronounced dead.
A second boy was receiving hospital treatment after being stabbed in the arm during the fight. Three people have been arrested by murder squad detectives investigating the teenager's death.
Park Campus is a specialist school educating some of London's most troubled young people, including those with social, behavioural and emotional difficulties.
Launched two years ago, it was hailed as the first school of its kind in Britain, aimed at getting young people back into mainstream education.
There are around 80 pupils aged between 11 and 16 at the school, which was purpose-built to minimise the risk to young people and staff. The newly-built school is also the headquarters for Lambeth Council's "behaviour partnership service", which supports young people elsewhere.