Scientists and officials with local and federal authorities have developed several hypotheses for what caused a deadly explosion at Accurate Energetic Systems.

In a news conference Oct. 24, Jamey VanVliet, the special agent in charge at the Nashville ATF office, did not say what those hypotheses are.

"I will not speculate on the cause of the explosion or comment on a potential cause, except to say at this point, there is no indication of a threat to public safety," VanVliet said. He did say that the area of origin for the blast was on the lower floor production level of the pour cast building. The building had six kettles total, with three on the main floor.

Confirming what caused the blast will take testing and restesting in labs, VanVliet said, and will not come fast.

The blast Oct.

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