A massive explosion has levelled the Accurate Energetic Systems plant in rural Tennessee. Photo: AP PHOTO

A blast has levelled an explosives plant in rural Tennessee, leaving behind a mass of twisted metal, burned-out shells of cars and at least 18 people missing and feared dead.

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"There's nothing to describe. It's gone," Humphreys County Sheriff Chris Davis said of the blast site at Accurate Energetic Systems, which supplies and researches explosives for the military.

He said it was one of the worst scenes he's ever seen and especially gut-wrenching because he knows three families

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