A 16-year-old boy has been stabbed to death in north London.
Police officers and the London Ambulance Service were called to Munster Square in Camden at about 23:10 BST on Monday.
Scotland Yard said the victim had been "chased around the square by a number of suspects" before being stabbed repeatedly.
A murder investigation has been launched and a crime scene remains in place. No arrests have been made.
Det Ch Insp Paul Healy said the attackers had fled in a vehicle "which was discovered burnt out nearby".
"Another vehicle believed to be involved in the incident was also found burnt out some distance away," he said.
A large police cordon stretching across a number of roads was in place on Tuesday morning.
The teenager's next of kin have been informed.