Unexploded gas cylinders are concerning firefighters at a blaze at a Tauranga auto-electrical workshop this morning.
It took firefighters more than an hour to put out the blaze that engulfed the two-storey building before dawn.
Fire and Emergency spokesman Daniel Nicholson said the cylinders were filled with argon and were "being treated with caution".
A fire safety investigator was also at the property to determine how the blaze started.
Earlier Fire and Emergency Northern communications shift manager Megan Ruru said six crews were at the fire that had engulfed the two-storey property in the suburb of Judea.
She said the alarm was raised at 4.40am.
The Koromiko St property was burning fiercely when firefighters arrived, she said.