No injuries were reported.
The Bergen County Prosecutor's Arson Investigations Unit responded to the Grace Avenue blaze, with members of the county sheriff's Bureau of Criminal Identification collecting evidence.
The attic fire first ignited just after 10:30 p.m., displacing a tenant, then kicked up again just after 5 a.m., blowing through the roof, responders said.
Damien Danis contributed to this article.
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ALSO SEE: A boy riding a bicycle was struck and killed by a box truck (in photo) Tuesday afternoon in Garfield, authorities confirmed.
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