McEWEN, Tenn. — The blast in rural Tennessee that leveled an explosives plant and was felt for miles around left no survivors, authorities said Saturday.

Humphreys County Sheriff Chris Davis said during a news conference that officials were working on the assumption that all of the people at the site were dead. The total number of people who died was unclear, as was the cause of the blast.

Davis earlier said 18 people were missing.

"We've recovered no survivors," he said.

The explosion Friday morning at Accurate Energetic Systems, which supplies and researches explosives for the military, scattered debris over at least a half-mile area and was felt by residents more than 15 miles away, Davis said.

Aerial footage showed the company's hilltop location smoldering and smoky Friday, with j

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