An explosives plant in rural Tennessee rocked by an explosion Friday that authorities said left 19 people missing and feared dead is owned by a company that processes explosives for the military, according to the company’s website.

The explosion at Accurate Energetic Systems’ flattened a building on its 1,300-acre campus and shook houses miles away. Rescuers had to keep their distance for hours due to burning debris and risk of secondary blasts. The smoldering wreck could be seen in aerial footage by WTVF-TV , black smoke billowing up.

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