First responders searched the rubble for missing people Friday after a powerful blast ripped through an explosives manufacturing plant in rural Tennessee, sending plumes of smoke into the air and shaking homes miles away.

Humphreys County Sheriff Chris Davis said 19 people were still missing and feared dead Friday afternoon.

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

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

Search ongoing

Rescuers had to wait for hours to begin their search because of the burning field of debris and risks of secondary explosions at the site southwest of Nashville, authorities said. The area is now secure and there is no longer a risk.

There are casualti

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