CHICAGO (CBS) — A mother and two children were taken to the hospital on Thursday, after Chicago firefighters extinguished a smoky extra-alarm fire at a high-rise apartment building in the South Shore neighborhood.

The fire started around 11 a.m. at a high-rise at 7145 S. Cyril Ct, causing heavy smoke inside the building. The building is more than 100 years old, and contains 48 units.

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Fire Department officials said the fire was contained to the 9th floor, and was extinguished by about 11:45 a.m. Firefighters had to use a fire escape to attack the fire.

Fire Department officials said a mother and two children who sheltered in place on the 13th floor during the fire later sought treatment for smoke inhalation, and were being taken to Jackson Hospital & Medical Center in good condition.

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The cause of the fire is under investigation.