FIVE people have been injured after a backyard diesel heater exploded at Medowie on Saturday night.
Emergency services were called to a home on Carnoustie Way about 8.30pm and found five people suffering serious burns.
A 50-year-old Medowie man and a 42-year-old Corlette woman sustained severe burns and were airlifted to Royal North Shore Hospital in a critical condition.
They were stabilised at the scene by NSW Ambulance paramedics and two helicopter medical crews.
Two Medowie men, aged 39 and 54, and a 40-year-old Raymond Terrace man were treated at the scene for serious burns to their bodies.
They were taken by road to John Hunter Hospital by NSW Ambulance paramedics.
Officers from Port Stephens-Hunter Police District have been told the diesel heater was being re-fuelled when the explosion occurred.
It is believed the incident took place at a backyard party.