Authorities are investigating a powerful blast that tore through an explosives plant in rural Tennessee as first responders say they’ve recovered no survivors.

Humphreys County Sheriff Chris Davis said Saturday authorities have recovered no survivors at the Accurate Energetic Systems site. The number of those killed and the cause are still unclear.

“This has probably been one of the most devastating situations that I’ve been on in my career,” Davis said through tears.

No survivors of blast at Tennessee explosives factory, according to sheriff

Here is what to know as officials try to determine what caused the explosion:

‘Slow, methodical method’

State officials brought in a “rapid DNA” team to help identify the remains of those recovered at the site, southwest of Nashville.

About 300

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