Mr Pyatt said the prohibited fire season had started yesterday and an investigation had been launched into the cause of the riverside blaze.
There had been reports of people in the area immediately before the fire broke out.
At the same time, three drivers were lucky to escape injury in what was initially thought to be a head-on collision on SH2 near Opaki.
Two fire appliances, an ambulance and several police cars were called to the crash, which left broken glass strewn across one side of the highway.
Acting Sergeant Eugene Moore said a young female driver in a south-bound Toyota ute swerved into the path of the oncoming vehicles.
"It veered across the road into the oncoming traffic ... close to the centre line but then came back in."
The elderly female driver of one north-bound car was able to pull over on to the verge to avoid the ute, but another car, a Mazda hatchback, collided with the ute.
The cars had "narrowly missed" being involved in a head-on collision in what appeared to be a case of driver inattention. Traffic on SH2 was reduced to one lane while police spoke to witnesses and examined the scene.