On Monday, December 1, 1958, a fire broke out at Our Lady of the Angels School in Chicago, Illinois, shortly before classes were to be dismissed for the day. The fire originated in the basement near the foot of a stairway. The elementary school was operated by the Archdiocese of Chicago and had an enrollment of approximately 1,600 students. A total of 92 pupils and three nuns ultimately died when smoke, heat, fire, and toxic gases cut off their normal means of escape through corridors and stairways.