Authorities in rural Tennessee say there are no survivors after a blast leveled a building at Accurate Energetic Systems' 1,300-acre headquarters near McEwen. Families of 18 people feared dead waited as Sheriff Chris Davis said anyone inside the plant is presumed dead and the effort has shifted from rescue to recovery, with DNA needed to confirm identities. The explosion, felt for miles, left the search complicated by explosives and secondary blasts. FBI and ATF investigators are probing the cause. AES thanked first responders; officials revised an initial toll of 19.

Prepared by Emily Rhodes and reviewed by editorial team.