UPDATE: 12 killed as violent storms ravage Midwest, South

Wednesday, February 29, 2012 | 9:18 p.m. CST; updated 10:01 p.m. CST, Wednesday, February 29, 2012

HARRISBURG, Ill. — A pre-dawn twister flattened entire blocks of homes in a small Illinois town Wednesday as violent storms ravaged the Midwest and South, killing at least 12 people in three states.