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Jeffrey D. Allred, Deseret News
Unified firefighters work on a house fire in Draper Friday, July 25, 2014. The home caught fire after what may have been a gas explosion. The occupant was transported to the hospital.

DRAPER — Unified Fire Authority investigators have ruled out natural gas as the cause of an explosion and massive fire that destroyed a Draper home and killed the homeowner.

Unified Fire Battalion Chief Brian Anderton said Monday that "some other form of accelerant" was spread in several places throughout the house at 15091 S. Junction Circle (235 East).

K-9s specialized in sniffing out accelerants were brought to the scene and "hit" on several spots throughout the structure, Anderton said.

What that tells investigators, he said, is that the fire was intentionally set. However, while he wouldn't directly say that Paul Broadhurst, 40, died as a result of suicide after starting the fire, he noted that investigators are currently "not looking for suspects."

Anderton also confirmed Monday that Draper police were called to do a welfare check on Broadhurst Friday about the same time the fire was reported.

Anderton said investigators will continue processing evidence, but the cause of the fire will likely go down as "undetermined" but "intentional" in nature.

Broadhurst was alone in the house when it exploded into flames. Friends said his wife and two children were in Idaho at the time.