MILWAUKEE (CBS 58) -- The Milwaukee Fire Department says seven residents were taken to hospitals for treatment after an apartment fire near 22nd and Hampton Tuesday afternoon. The 911 call came in at 1:37 p.m. 

According to Milwaukee Fire Chief Aaron Lipski, crews arriving on scene found several people hanging from windows on the second and third floors of the complex. 

CBS 58

Chief Lipski said an elderly woman was rescued and CPR was performed before she was transported to the hospital. Six other residents were also taken to hospitals with injuries he described as less critical.

Officials say the apartment complex, which was built in 1979, does not have a sprinkler system.

"I cannot stress the important of having sprinklers in buildings, Chief Lipski said during a press conference Tuesday afternoon. "Whether the building is built tomorrow or 10 years ago or 25 years ago, we've got to get serious about the sprinklers."

"I think these landlords, these property owners should be proactively coming forward and letting us know," Milwaukee Mayor Cavalier Johnson said of the sprinkler systems.

The fire department says the cause of the fire is under investigation.