Police were called at 6.40pm on Wednesday, 18 October after reports a man had been shot near Sudbury Hill Underground Station on Greenford Lane.
Officers attended along with the London Ambulance Service. A 19-year-old man was found with gunshot wounds.
He was taken to hospital where his injuries are being assessed, but are not thought to be life-threatening.
Officers from the Specialist Crime Command (Trident) are investigating and want to hear from anyone with information about the shooting.
It’s believed the victim was chased along the street before being shot a number of times.
At this early stage of the investigation, there have been no arrests.
Anyone with information is asked to call 101, quoting reference Cad 5795/18Nov.