Police were called at 10:18 am today, Sunday, 14 June, to reports of a stabbing in Portland Rise Estate, N4, just off Green Lanes.
The victim, a man (no futher details) was taken to an east London hospital where he remains in critical condition.
Officers, London Ambulance Service and London’s Air Ambulance attended the scene.
Three men aged 42, 27, and 31 have been arrested on suspicion of grievous bodily harm and taken to an east London police station where they remain in custody.
Road closures along Green Lans are in place, between Seven Sisters Road and Spring Park Drive.
Anyone who may have witnessed the incident or has any information is asked to contact police on 101.