Emergency services were called to York Gardens at around 6.06pm.
Officers attended the scene along with London Ambulance Service and London’s Air Ambulance.
The victim was treated for stab wounds and taken to hospital.
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His injuries are not believed to be life-changing.
No arrests have been made and enquiries are ongoing.
Anyone with information is asked to contact police on 101, quoting reference 6734/11JULY.
Reports can also be made anonymously to Crimestoppers on 0800 555 111 or via the charity’s website.
