A murder investigation has started after a teenage boy was stabbed to death, the Metropolitan Police said.
Officers were called following reports of a seriously injured male in North End, Croydon, south London, at around 7pm on Sunday.
They found the victim, who is believed to be 17, with serious stab injuries.
Officers administered first aid before the London Ambulance Service arrived, but he was pronounced dead at the scene.
Police believe they know the identity of the victim and enquiries are under way to locate his next of kin.
Scotland Yard said detectives from the Homicide and Major Crime Command are investigating, that a cordon remains in place at the scene and no arrests have been made.
Formal identification and a post-mortem will also be arranged.
Anyone with information that may assist the investigation should call police on 101 or Crimestoppers on 0800 555 111.