A deadly blast rocked a US explosives factory Friday, sending emergency responders rushing to the site and prompting official warnings for the public to avoid the area as multiple people were reported missing.

"We can confirm there has been an explosion at Accurate Energetic Systems in the Bucksnort area," located in Hickman County, Tennessee, the local sheriff's office wrote on Facebook.

"Emergency services are currently on the scene working to address the situation.

"Please avoid the area to allow emergency responders to do their work. If you are in the area, stay clear and follow the instructions from local authorities."

The mayor's office in Hickman County told AFP that it could not immediately confirm any fatalities or the cause of the explosion.

But Humphreys County Sheriff Chri

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