Four firefighters were injured after a "mayday" was called at a fire on the South Side Saturday morning, officials said.
The fire, in the 9000 block of South Muskegan Avenue, began around 8:43 a.m., in the building’s basement, sparking a 2-11 alarm, fire officials said.
The Mayday was canceled minutes later after all firefighters were accounted for, however, four firefighters were transported to an area hospital, Chicago Fire Media tweeted.
The injuries were sustained when the building's stairwell collapsed.
Two firefighters suffered respiratory issues and two others received "minor injuries" from the fire but all were reportedly in "good condition."
The cause of the fire is still under investigation.