Residents labored Saturday to begin rebuilding a day after tornadoes killed 12 people in Tennessee, the second wave of violent weather to hit the state in less than a week. Crews worked to clear away the wreckage and restore services, but some people could be without electricity for a week, officials said. Police patrolled the wrecked neighborhoods Saturday but there had been no reports of looting. Bystanders were warned not to smoke because of leaking gas. The tornado's path through the Gallatin area was at least 10 miles long, said Jimmy Templeton of the Sumner County Sheriff's Department.