Three firefighters were injured while battling a fire Tuesday at a glass factory in south suburban Chicago Heights.

Crews were called about 11:30 a.m. to reports of smoke at Gerresheimer Glass at 111 Arnold St., Chicago Heights Fire Dept. Chief Jeffrey Springer said in a statement. Upon arrival, firefighters saw smoke coming from the doors and windows.

Several other fire department companies were called to help extinguish the fire, Springer said. The fire was caused by a leak in a furnace.

Three firefighters were injured at the fire and were taken to hospitals, Springer said. Two of them were treated and released, and the third was held for observation.