An air ambulance attended the scene in Park Avenue, Potters Bar
A helicopter flew in to help a teenager in cardiac arrest, who has now been taken to hospital.
The ambulance service were called at 5.02pm yesterday (October 20) to Park Avenue, Potters Bar.
The boy was in cardiac arrest and resuscitated at the scene before being taken by road ambulance to Barnet General Hospital in serious condition.
An air ambulance from East Anglian Air Ambulance, two rapid response vehicles, an ambulance crew and an ambulance officer attended the scene.
Police were called at 5.06pm but have not been involved since leaving the scene.
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