Excerpts from cbsnews.com:

Two firefighters and a civilian were injured in a fire in the South Shore neighborhood Monday evening.

The fire broke out on the second floor of a three-story, multi-unit apartment building in the 1400 block of East 69th Place. Two people jumped out the second-floor window to escape the fire before firefighters came. They were not injured.

A staircase collapsed resulting in the fire department losing communication with some members. A mayday was called, but everyone was ultimately accounted for.

A woman was taken to the University of Chicago Medical Center from the scene in good condition, while two firefighters were also transported to the same hospital with minor injuries, though the firefighters’ injuries were not related to the mayday.

The cause and origin of the fire remained under investigation late Monday, Walker said. The building was left uninhabitable by the fire, but it was not immediately known how many people were displaced.