A teenage boy has died after he was stabbed in Islington, north London.
The Met Police said officers were called to Holland Walk at about 17:30 GMT to reports of a stabbing.
Paramedics and the air ambulance attended but despite efforts to save him, he was pronounced dead at the scene. His next of kin have been told.
One man has been arrested on suspicion of affray. A Section 60 - allowing officers stop and search powers - has been granted until 07:00.
Anyone with information has been urged to contact the police.