Tornadoes that tore through parts of the South and Midwest killed at least 11 people, collapsed the roof of a packed theater during a heavy metal concert in Illinois, and left small towns and big cities throughout the region bewildered Saturday by the damage. Possibly dozens of tornadoes touched down into the night across at least seven states, laying waste to homes and businesses and splintering trees, as part of a sprawling storm system that also brought wildfires to the southern Plains and blizzard conditions to the Upper Midwest. Tens of thousands lost power as the storms smothered a swath of the country home to some 85 million people. The dead included four in the small town of Wynne, Arkansas, and three in Sullivan, Indiana. Other deaths were reported in Alabama, Illinois, Mississippi and the Little Rock area. The storms struck just hours after President Joe Biden visited the Mississippi community of Rolling Fork, where tornadoes last week destroyed parts of town.