CARRIER MILLS, Ill. (KMOV.com) -- At least six firefighters were treated for heat exhaustion while fighting a blaze that burned nearly 100 acres of thick grass and brush in southern Illinois near Shawnee National Forest Friday afternoon.
Crews from several departments responded to the fire, located about 35 miles east of Carbondale, Ill., just after 4:30 p.m.
Officials said at least five firefighters were treated at the scene and one other was hospitalized for heat exhaustion.
Uneven terrain and thick brush caused the fire to burn rapidly and caused problems for crews, according to fire officials.
The cause of the fire is still under investigation, but officials said a cigarette may have sparked the blaze.