A low level of hydrogen cyanide was found around the Chemtool plant that went up in massive flames on Monday, and the structure may continue to burn for a week.
CBS 2's Brandon Merano reports.
Fire at Illinois chemical plant under control, but area residents still unable to return home
Fire officials in Rockton, roughly 95 miles northwest of Chicago, say they will let the blaze burn out itself over concerns about..
WGN
