A teenager has been charged after he allegedly doused an ambulance with petrol during his own 18th birthday party in Sydney’s south-west.

Emergency crews were called to a home on Devonshire Road in Rossmore about 11:30pm yesterday after reports a 14-year-old boy had fallen into a bonfire.

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Two ambulance vehicles arrived at the property and paramedics treated the teenager before he was taken to The Children’s Hospital at Westmead with burns to his face and hands.

He remains there in a stable condition.

Green Valley Police Acting Inspector Branko Kubecka said when an ambulance officer arrived back at the property to pick up the remaining ambulance he found that petrol had been poured over it.

“There was no visible damage in terms of fire, but he noticed it was wet and smelling strongly of petrol,” Acting Inspector Kubecka said.

“NSW Rural Fire Service was called and washed the car down, however, the strong smell of petrol remained.

“And inside the cabin, it will need to be detailed and cleaned properly.”

He said police later arrested an 18-year-old male, whose birthday party it was, and charged him with malicious damage.