NASHVILLE, Tenn. (AP) — Authorities plan to give an update Friday on the massive blast at a Tennessee explosives plant that killed 16 people.

The delicate investigation at the Accurate Energetic Systems plant hasn't determined the cause of the Oct. 10 explosion , which killed people ages 21 to 60 . The Tennessee Bureau of Investigation has positively identified 14 of the 16 victims using rapid DNA testing, authorities said.

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