A 79-year-old Oklahoma man was killed Sunday night when a tornado touched down on his mobile home in Shawnee, Okla.—one of a series of twisters to sweep through the Plains states as part of a severe weather system that stretched from Texas all the way north to Minnesota. At least 20 more were injured in Oklahoma alone. “It looks like there’s heavy equipment in there on a demolition tour,” said Oklahoma’s Pottawatomie County sheriff, Mike Booth. “It’s pretty bad. It’s pretty much wiped out.” A tornado touched down in Golden City, Mo., early Monday, but the extent of the damage—as well as the number of injuries—was not immediately clear. Another tornado touched down about 30 miles west of Des Moines, Iowa—the first to hit the state in nearly a year.