FREMONT, Neb. —

Some of the first 911 calls placed in the moments after Fremont's deadly plant explosion show the panic of people who witnessed the blast.

The blast last month at the Horizon Biofuels plant killed a father and his two daughters .

In the calls obtained by ABC News, you can also hear the quick reaction of witnesses as the plant went up in the flames .

Video shows moment of explosion at Horizon Biofuels plant in Fremont

"There was an explosion at the Golden Sun. It's currently on fire."

"I just see ... the building has just exploded."

"A building just blew up!"

"I did see a big fireball. The top of the roof is missing."

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Nebraska state fire investigators believe an accidental dust fire caused the explosion on July 29.

Horizon Biofuels was in the buil

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