Humphreys County Sheriff Chris Davis addresses the search efforts for 18 people still missing after an explosion at Accurate Energetic Systems explosives plant in Tennessee. #fox #media #breakingnews #us #usa #new #news #breaking #foxnews #tennessee #explosion #chrisdavis #sheriff #humphreyscounty #search #missing #disaster #accident #emergency #rescue #investigation #crime #crimenews #crimestory #criminal #police #fire #plant #manufacturing #safety #community #localnews #firstresponders