Firefighters were kept busy overnight, with several fires erupting across Perth within hours of each other.
The first, at Furnace Technologies on Cutler Road in Jandakot, was reported just before 6pm with claims there were explosions coming from the back of the business.
When emergency services and Western Power arrived, the blaze was already “well developed” at the rear of the commercial building.
District officer Adrian Hamill said “there was no visible flame heights from the front of the building” when firefighters arrived, but that “there was a large plume of smoke which was visible whilst they were driving”.
He said once on scene, they “quickly made access through the two front gates and realised that there was a fire at the rear of the premise”.
“The fire is located in a paint booth, which would suggest paint and other chemicals which would be sufficient to explain why there were some explosions reported,” he said.
“They quickly laid hose from the road all the way to the rear … and made quick access and immediately put water onto the fire.”
It took 12 crews to bring the fire under control in about 22 minutes.
“(There were) no injuries, there was no one present when they arrived,” Mr Hammill said.
With the cause of the blaze undetermined, fire investigators were requested, and will arrive at the building about 8.30am on Friday.
Just less than 12 hours later, about 3.30am on Friday, Fire and Rescue Service firefighters were called to another structure fire, this time in Balga.
Seven crews attended the blaze, located on Stedham Way and found the single-storey structure fully engulfed.
It took them 25 minutes to bring the fire under control, and Western Power also attended.
The cause of the blaze is still being investigated.