Elmwood Park firemens reacted about 3:45 p.m. to the 2600-block of North 72nd Court for a reported blaze in a three-flat building.
Chopper 7 recorded big flames shooting out the roofing of the building simply after 4 p.m.
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Firefighters might be seen on top of the roofing and on ladders close by, attempting to set out the blaze.
Two households were displaced, and a cat is unaccounted for, authorities said.
No one was hurt in the event.