Police were called at 5.09pm to reports of a stabbing in Ladbroke Grove at the junction with Treverton Street.
A 16-year-old boy and a 15-year-old boy were found with stab wounds and taken to a central London hospital.
Police said neither boy's condition was believed to be life-threatening, and no arrests had been made.
A man presented himself to officers at Kensal Rise tube station and told them he had been stabbed resulting in a cut to the head.
Police said he declined to provide further details and subsequently left the scene. Enquiries are ongoing.
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