A massive six-alarm fire ripped through five Brooklyn buildings Tuesday night, injuring 11 people and displacing dozens of families, officials said.

The flames started in a building along DeKalb Avenue near Wilson Avenue around 10 p.m. and quickly spread to several other surrounding buildings.

It took firefighters more than three hours to bring the inferno under control, the FDNY said.

Seven people were treated at the scene for minor injuries and smoke inhalation, but declined to go to the hospital, fire officials said.

Four others were taken to Wyckoff Heights Medical Center for treatment, including one firefighter who suffered minor injuries and a civilian who was listed in serious condition.

The cause of the fire is still under investigation.