NASHVILLE, Tenn. — 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.

Investigators haven’t said what materials exploded or what ignited the blast. In addition to trying to recover all of the victims’ remains, investigators are also looking for any dangerous materials that might need to be disarmed.

Bridgette Mason, a spokesperson for the Bureau of Alcohol, Tobacco, Firearms and Explosives, said Friday’s news conference will include “discussi

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