July 21, 2009 1:56 pm BROLL: Chemical Explosion Sky 5 is over the scene of a chemical explosion in the Humboldt Park neighborhood. Local 2:57 Wednesday morning weather 2:03 Indiana primary results yield fascinating matchups in gubernatorial, Senate races 2:01 Barn collapses in Harvard during severe storms, killing multiple animals 1:44 Valerie McCray speaks after winning Democratic nomination for U.S. Senate in Indiana's primary election 0:27 Emergency crews scramble to locate animals trapped in collapsed barn in McHenry County