A tornado unleashed a "war zone" of destruction in northwest Ohio, destroying dozens of homes and an emergency services building as a line of storms killed at least seven people and briefly threatened the Northeast on Sunday. Storms collapsed a movie-theater roof in Illinois and ripped siding off a building at a Michigan nuclear plant, forcing a shutdown. But most of the worst was reserved for a 100-yard-wide, 7-mile-long strip southeast of Toledo now littered with wrecked vehicles, splintered wood and family possessions. The tornado ripped the roof and back wall off Lake High School's gymnasium at about 11 p.m. Saturday, several hours before the graduation ceremony was supposed to begin. The school board president said one of the victims was the father of the class valedictorian. Two buses were tossed on their sides and another was thrown about 50 yards, landing on its top near the high school's football field. More than 10 hours later, its right turn signal was still blinking.