Excerpts from cbs.local.com:

A fire broke out Sunday night in a three-story apartment building at 4820 S. Dr. Martin Luther King Jr. Dr. in Bronzeville. Three Chicago police officers were hurt. The officers rushed in before Chicago firefighters arrived. They knocked on doors to wake people sleeping inside before the smoke and flames overwhelmed them. One of the officers collapsed at the scene. All three officers and four residents suffered smoke inhalation and were transported to hospitals.

A 5-year-old boy was in good condition and being treated at Mercy Hospital Saturday morning. The officers were still recovering late Sunday, but were in good condition at the emergency room.

The building, which was built in 1905, was reduced to a burned-out shell. Firefighters were not saying Sunday what triggered the extra-alarm blaze, but they said it is not suspicious.

Despite a massive amount of smoke, witnesses said the officers ran into the burning building trying to get people out.

Firefighters believe the fire started in the basement before quickly spreading to the upper floors.