The incident occurred at approximately 13:02 on Tuesday 09 December, when Police Officers were summoned to reports of a stabbing on Westbourne Road.
Police attended the scene alongside personnel from the London Ambulance Service and London's Air Ambulance.
Despite the exhaustive efforts of medical staff, the teenager succumbed to his injuries later that afternoon.
His family have been notified and are receiving support from specialist officers during this distressing period.
"Our thoughts are with the family and friends of the victim at this incredibly sad and difficult time. We understand this is profoundly concerning for the community, particularly given the young age of the victim.
"Officers are in the area conducting urgent enquiries, and cordons remain in place. I would urge anyone who witnessed the incident or possesses any relevant information to contact us, or to do so anonymously via CrimeStoppers."
Individuals with information that could assist Metropolitan Police are encouraged to call 101, quoting reference CAD 3568/09DEC.
Alternatively, those who wish to remain anonymous can do so by contacting CrimeStoppers on 0800 555 111.
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