A murder investigation has been launched following the death of a 17-year-old male in Enfield.
Police were called at approximately 21:35hrs on Friday, 30 January to reports of a male collapsed on the pavement at Berkeley Gardens, N21.
Officers and London Ambulance Service attended and found the male suffering from stab wounds.
He was taken to a central London hospital in a critical condition. He died a short while later.
Next of kin have been informed.
Officers believe they know the identity of the deceased but formal identification awaits.
A post-mortem examination will take place in due course.
Four people have been arrested in connection with this investigation. They are: two 17-year-old males [A and B]; a 17-year-old female [C] and a 46-year-old-woman. All four have been arrested on suspicion of murder.
They all remain in custody to at separate north London police stations.
Officers from the Homicide and Major Crime Command based at Barking investigate.
Anyone with information is asked to contact the incident room on 020 8345 3775 or call Crimestoppers anonymously on 0800 555 111.
Enquiries continue.