Multiple people are dead and several others are unaccounted for after a blast on Friday morning in Tennessee at a military explosives plant, according to law enforcement. The explosion at Accurate Energetic Systems about 50 miles (80km) west of Nashville occurred at 7:45am local time (1245 GMT), Humphreys County Sheriff Chris Davis told a press conference. "We do have several people at this time that's unaccounted for," he said,...