Major damage, several injured as tornadoes sweep through Iowa

DES MOINES, Iowa -- A flurry of tornadoes that formed unexpectedly swept through central Iowa Thursday, injuring at least 17 people, flattening buildings in three cities and forcing the evacuation of a hospital. The tornadoes hit Marshalltown, Pella and Bondurant as surprised residents ran for cover. The storms injured 10 people in Marshalltown and seven...