DES MOINES, Iowa (AP) — A tornado struck Missouri, causing an unknown number of injuries, as severe thunderstorms packing the threat of more hail and tornadoes were forecast across parts of the Midwest and South. Wednesday’s storms threatened a region that includes portions of the country still reeling from deadly weekend weather. The Storm Prediction Center says up to 40 million people from Chicago, Indianapolis and Detroit to Memphis, Tennessee, were at risk for storms later Wednesday, with the greatest threat from lower Michigan, across the middle to lower Ohio River valley and into the mid-South. The National Weather Service said a tornado struck in Bollinger County in southeastern Missouri on Wednesday morning, causing an unknown number of injuries. At least two tornadoes were confirmed Tuesday in Illinois as storms targeted the state and eastern Iowa and southwest Wisconsin before nightfall.