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Footage shows the youngster engulfed in flames moments after the horror. It is believed he has suffered serious burns to the majority of his body.
Emergency services dashed to the scene in Ballysillan, Belfast, Northern Ireland.
A Northern Ireland Fire and Rescue Service (NIFRS) spokesperson said: "The NIFRS attended the incident in the early hours of this morning and administered first aid to the casualty until paramedics from the ambulance service arrived to support him."
Police are appealing for witnesses.
Superintendent Henry said: “Police received a report at around 00:30am that a male had sustained burn injuries. As a result of the incident, he sustained burns to his face and body. He remains in hospital for his injuries.