On Friday, four days after the Chemtool Inc. plant exploded in a massive fireball, evacuated residents who lived within a mile radius of the plant can return home.
Fire officials in Rockton, roughly 95 miles northwest of Chicago, say they will let the blaze burn out itself over concerns about chemical runoff into a nearby river.
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.