Two teenagers were killed last night (Jan.
Emergency services were called to West Harrow Park shortly after 8:30 p.m.
The London Ambulance Service also treated a 17-year-old boy who was knife wounds on the scene before he was rushed to hospital.
The other boy, 15, suffered severe stab wounds and was taken to the emergency room and is now in critical condition.
A rescue helicopter was seen visiting the crime scene and then taking off while the area was cordoned off.
One crime scene remains, arrests have not yet been made.