Excerpts from the ChicagoTribune.com:

Summit firefighters were called to the 7600 block of West 61st Place about 2:30 a.m. Saturday and found heavy smoke and fire coming from an apartment building.

All 12 occupants of the three-unit structure escaped, but one needed to be treated for smoke inhalation, and a  firefighter was treated for exhaustion.

The Red Cross provided housing assistance to the residents. The cause of the fire remains under investigation. Several other fire departments provided mutual aid, including Oak Lawn, Evergreen Park, and North Palos.