Firefighters were called to 2223 Cortelyou Road in Flatbush around 12:17 a.m. Sunday.
More than 100 firefighters responded to the blaze that started on the 4th floor.
Nine people were injured, including 3 firefighters.
All of the victims' injuries were minor.
They were taken to Kings County Hospital.
Investigators are working to figure out what caused the fire.
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