Police are investigating the fire and treating it as suspicious, Inspector Mick Aldridge said.

About 20 firefighters including the hazardous materials unit were involved in battling the blaze.

A woman rushed out of her cabin when she heard an explosion and saw flames coming from next door just after 6pm.

Inspector Aldridge said an off-duty ambulance officer was driving past and saw the flames. The officer called emergency services at 6.10pm, and police were on the scene first to begin evacuations. 

"Our biggest concern was not only the ferocity of the fire, but the 90kg gas cylinders located at outside each cabin," Inspector Aldridge said.

Laurieton Fire Brigade Captain Les King said the cylinders were venting when his personnel arrived.

"The two cylinders sounded like boiling kettles," Captain King said.

"That means they were just about to go."

Firefighters applied water to the outside of the cylinders until it was safe for them to be manually turned off.

Two Essential Energy technicians arrived at 7.40pm to turn off all power to the site. 

Firefighters in masks with thermal equipment then moved through the wreckage, first removing the cylinders and searching for any other dangers.

Inspector Aldridge said that during the evacuation the only people not accounted for were the two previous occupants of the van where the fire is believed to have started. Those two people were asked to leave the caravan park on Friday.

"We don’t believe there are any deceased persons at this stage," Inspector Aldridge said.

"We know definitely one of them did leave, we are just trying to account for the other person." 

Saturday, 6.45pm: Emergency services flooded Christmas Cove caravan park due to a fire on Saturday night.

Firefighters from Camden Haven and Port Macquarie were attending the fire, located at the residential and holiday accommodation on Ocean Drive, at 6.30pm.

Police were also on the scene.

It is not known how the fire started, or if anyone was injured.

More details and photographic coverage to come.