FREMONT, Neb. (WOWT) - Two days after a horrific explosion at a biofuels plant left a man and two girls dead, the state fire marshal told First Alert 6 the incident started with a dust fire — and was an accident.

“A preliminary investigation indicates an accidental dust explosion occurred during the manufacturing process. Additional investigation efforts are currently impeded due to the instability of the structure,” the Nebraska Fire Marshal agency said in a statement Thursday afternoon.

The state told First has completed its initial investigation of the incident at Horizon Biofuels, which manufactures wood pellets and animal bedding under the name Elkhorn Valley Animal Bedding.

OSHA, however, remains at the scene and must — by law — complete its investigation within six months.

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