Authorities said the blast happened around 1:30 p.m., at the House-Autry Mills plant, at 7000 U.S. Highway 301 South in Four Oaks. The plant produces corn meal.
Johnston County Fire Marshal Paul Whitehurst said a hatch flew off a hopper at the back of the building, but investigators do not know what caused that to happen.
The blast knocked down a wall; a fire was contained to one section if the building.
The facility was created in January 2001 after relocating from Newton Grove.
Officials evacuated the plant. No one was injured.
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