Three firefighters were injured, one critically, while battling a blaze in a high-rise building on Chicago's North Side on Wednesday, authorities said.
The blaze was reported before 8 a.m. on the 27th floor of the condo and apartment building in the Gold Coast neighborhood.
Fire department video showed flames and smoke pouring from a terrace.
CHICAGO FIREFIGHTER DIES AFTER BEING INJURED WHILE FIGHTING FIRE ON CITY'S SOUTH SIDE
By mid-morning most of the blaze had been extinguished, but crews were still addressing hot spots and smoke.
"The fire is not yet under control," said Fire Department Director Larry Langford. "We don't know how it started."
CHICAGO REP. CHUY GARCIA ANNOUNCES DEATH OF DAUGHTER AT 28
Langford described one of the firefighters as being in "very critical" condition. Two others were in stable condition.
No residents were reported injured and the person who lives in the burning apartment was able to make it out safely, Langford said.
CLICK HERE TO GET THE FOX NEWS APP
Chicago firefighter Jermaine Pelt, 49, died on Tuesday while battling a house fire on the city's South Side. Authorities said two other firefighters also were injured in that blaze.