Multiple people are dead and many are unaccounted for after a “massive” blast rocked a military explosives company in Tennessee, law enforcement officials say.

“We do have some folks, we can confirm that we do have some that are deceased,” Humphreys County Sheriff Chris Davis said at a news conference on Friday.

The explosion happened at Accurate Energetic Systems near Bucksnort just before 8 a.m., local outlets reported.

A statement released by Humphreys County urged people to avoid the area.

“Emergency personnel are on scene and actively managing the situation. Please avoid the area to allow responders to work safely and efficiently,” the statement read.