A 17-year-old boy has been arrested on suspicion of murder after another teenage boy, 16, was stabbed to death in west London.
Officers were called to reports of a stabbing in Bourne Avenue, Hayes, around 1.30pm on Friday, the Metropolitan Police said.
The force confirmed the identity of the victim on Saturday as Kamari Johnson.
London Ambulance Service and London’s Air Ambulance also arrived within minutes but despite the efforts of medics, the boy died at the scene.
Kamari’s next of kin have been informed and his family are being supported by specially trained officers.
A 17-year-old boy was arrested on suspicion of murder on Saturday evening and remains in custody, the Met said.
Any local residents who may have captured footage on doorbell or dashcam devices have been asked to come forward.
Detective chief inspector Alex Gammampila said: “Kamari’s murder has understandably caused shock and concern amongst the local community.
“A team of experienced detectives is working tirelessly to establish what happened to Kamari and why he was attacked.
“This evening’s arrest demonstrates the progress we are making and this is in no small part due to the assistance we’ve had from the community.
“We need to work together to ensure Kamari’s family get the answers they deserve about what happened to him.”
Anyone who witnessed the incident or has information that could help has been asked to call 101 or post @MetCC ref CAD 3832/24 May, or call the independent charity Crimestoppers anonymously on 0800 555 111.