A 15-year-old boy is in a stable condition after being stabbed.
Emergency services were called to a reports of a fight in Springfield Lane, in Kilburn, at 3pm on Tuesday (May 28).
Metropolitan Police officers attended alongside the London Ambulance Service.
A 15-year-old boy was found with a stab injury and taken to hospital where he is not in life-threatening condition, Scotland Yard said.
A spokesperson for the LAS said they were called to the incident at the junction of Langtry Road and Kilburn Priory, NW6.
They added: “We sent resources to the scene, including an ambulance crew, a paramedic in a fast response car, an incident response officer and members of our tactical response unit. We also dispatched London’s Air Ambulance.
“Our first paramedics arrived on scene in less than five minutes.
“We treated a teenager at the scene before taking them to a major trauma centre.”
No arrests have been made. Police say enquiries are continuing.
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