(CNN) — The catastrophe at a Tennessee explosives plant started in a building that made devices used for mining and detonated more than 24,000 pounds of explosives, authorities said Friday.

The October 10 disaster killed 16 employees at Accurate Energetic Systems , which makes military and demolition explosives about 60 miles west of Nashville. The blast was so intense, it registered as a 1.6 magnitude earthquake, according to data from the U.S. Geological Survey .

Fourteen of the victims were quickly identified with the help of rapid DNA testing . But two weeks later, the remaining two victims’ remains have not been found, Humphreys County Sheriff Chris Davis said.

The searches for the victims and the cause of the blast have been treacherous, with debris hurled miles away and

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