CROWN HEIGHTS - Seven people, including five firefighters, suffered minor injuries today in a three-alarm fire in Crown Heights. 

Nearly 150 firefighters rushed to Saint Marks Avenue at around 11 a.m. Wednesday after flames broke out on the top floor of a home and then spread to two others. 

Chopper 12 was overhead as crews got the blaze under control. 

Firefighters say they are concerned about the structure of the building. Deputy Chief Michael Ajello says the roof area has sagged down into the top floor of the building.

The cause is under investigation.