A blast at an explosives plant in rural Tennessee left 19 people missing and feared dead, authorities said.

Humphreys County Sheriff Chris Davis said the blast at Accurate Energetic Systems, which supplies the military, was one of the worst scenes he's ever seen.

He said multiple people were killed but declined to say how many, referring to the 19 missing as "souls" because officials were still speaking to family members.

"There's nothing to describe. It's gone," Mr Davis said of the plant.

The blast occurred about 7:45 am local time, Mr Davis said, with aerial footage by WTVF-TV showing the smouldering hilltop facility and the burnt-out shells of vehicles.

People reported hearing and feeling the explosion from miles away.

The company's website says it makes and tests explosives at a

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