Elmwood Park firefighters responded about 3:45 p.m. to the 2600-block of North 72nd Court for a reported blaze in a three-flat building.
Chopper 7 captured large flames shooting out the roof of the building just after 4 p.m.
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Firefighters could be seen on top of the roof and on ladders nearby, trying to strike out the blaze.
Two families were displaced, and a cat is unaccounted for, officials said.
No one was injured in the incident.