Two people, whose names have yet to be released, were killed in the crash when a sedan and LPG tanker collided.

The tanker was leaking gas as a result of the collision and, at one point, an 800 metre exclusion zone was placed around the crash site while NSW Fire and Rescue contained the situation.

Superintendent Brad Porter, from NSW Ambulance, spoke on Thursday about the confronting scene faced by first responders at the double fatality.

He said NSW Ambulance received multiple triple-0 calls to the Mount Lambie crash, which occurred at about 1.30pm on Wednesday.

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"When we arrived, the scene was horrific," he said.

The first responders on the scene, he said, were an off-duty paramedic and army officer "who were able to get the male and female out of the truck and out of danger".

He said when paramedics arrived, they found "the car had been heavily impacted and, unfortunately, inside the sedan were two deceased people".

"The impact on the sedan was so bad there was very little chance the two occupants of that car would have survived," he said.

He said once it was determined the two occupants had not survived, paramedics also had to ensure there were no other passengers in the back of the car, "which was quite difficult given the condition of the car".

Supt Porter said all paramedics called to the scene were taken off the road after the incident for a debrief and counselling was provided.

Supt Porter said a number of ambulances and duty managers attended the scene, along with many other emergency services.

He said that included NSW Fire and Rescue colleagues, who managed the gas tanker, and police officers, who were managing the incident.

He commended the efforts of the off-duty paramedic, who was en-route to Sydney, and the army officer, who removed both surviving victims from the gas tanker.

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