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Firefighters quickly went to defensive operations as flames tore through the 3½-story, wood-frame building on North 7th Street after igniting shortly after 2 a.m.
Most of the interior collapsed within an hour.
The fire captain was taken to St. Barnabas Medical Center in Livingston with burns that weren't considered life-threatening, authorities said.
All of the residents got out OK and no other injuries were immediately reported in the three-alarm fire, they said.
City officials said that 49 residents were displaced and receiving temporary lodging, food and clothing from the American Red Cross.
The cause wasn't immediately determined.
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ALSO SEE: A firefighter sustained a minor injury falling down stairs during a destructive blaze that blew through the rear of a multi-family, mixed-use Garfield building late Friday into Saturday.
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