Nineteen people were missing and possibly dead after a devastating explosion on Friday morning at a military explosives plant in Tennessee, officials said.

The explosion at Accurate Energetic Systems about 50 miles (80 km) west of Nashville occurred at 7:45 a.m. local time (1245 GMT), Humphreys County Sheriff Chris Davis told a press conference.

Davis said there were multiple fatalities but it was still too early to know precisely how many people had perished, saying it was still possible there were some survivors.

When asked to describe the building where the blast occurred, Davis said, "There's nothing to describe. It's gone."

Investigators from the FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives were at the scene working to determine the cause of the explosion, Davis

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