NASHVILLE, Tenn. (AP) — Authorities plan to give an update Friday on the massive blast in Tennessee that killed 16 people earlier this month at an explosives plant, where a painstaking, ongoing investigation has not yet determined the cause of the explosion.

The explosion on Oct. 10 at the Accurate Energetic Systems plant claimed the lives of people ages 21 to 60 years old. Authorities have said the Tennessee Bureau of Investigation has positively identified 14 of the 16 victims using “rapid DNA” technology.

There has not yet been an announcement about what specific materials exploded, or what ignited the blast. The investigation involves delicate searches for both victims’ remains and for any dangerous materials that need to be disarmed.

Bridgette Mason, a spokesperson for the Bureau o

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