A specialist search team has located the second victim of the Thursday morning fire.
FENZ has yet to confirm what the chemical was.
Tumble dryer lint was the cause of an Omarau house fire last year.
Ward Line remains closed will investigations are carried out.
The building's owner says they've had a significant problem with squatters.
Nearly a dozen wildfires broke out across the South Island on Saturday, which continue to be monitored for hotspots.
Crews will remain on site dampening down hotspots for the remainder of the afternoon.
She is expected to appear in the Auckland District Court later this month.
The blaze was well-involved when firefighters arrived at the property.
The fire has been burning for more than six hours.
"I'm hoping the lessons that should've been learned on 16 May 2023 are not lost."
A fire investigator is now at the scene to determine the cause.
The surviving resident spoke of waking up after hearing the horn.
Fire and Emergency Assistant Commander Brendon Irwin has confirmed two people died.
"It's good to see how other people tackle similar problems."
The road is expected to remain closed until Thursday morning.
Fire officers arrived at the scene just after 9.30pm and activated a third alarm, the highest level, when its scale became apparent.
Here's what we know.
The fire has been extinguished and an investigation will take place today.
The eatery has recently re-opened after a refurbishment with new owners.
