Emergency services were called to High View Parade shortly before 3pm.
Officers at the scene found a boy with stab wounds in the stomach.
A police cordon remains in place at a roundabout in Redbridge while an investigation is carried out.
Pictures from the scene shows a police car and two busses stationary at Clayhall roundabout.
Traffic has been halted from the northbound Woodford Avenue.
This is a developing news story, more to follow.