Firefighters battled a 5-alarm blaze at an apartment complex at 10 Franklin Ave. in Revere, Massachusetts on Sunday afternoon.
Approximately 40 to 50 people live in the building, and they all made it out safely before part of the roof collapsed.
A few firefighters were treated for smoke inhalation and heat exhaustion.
The Red Cross is heading to the scene to assist families.
No further information was immediately available.