Local authorities didn't immediately disclose a possible cause of the two-alarm Valley Boulevard blaze, which broke out in a common basement area below Emilia Romagna Pizza & Ristorante around 8 a.m. Monday.
They did, however, alert the Bergen County Prosecutor's Arson Investigations Unit after allegedly finding separate points of ignition.
No injuries were reported.
Carlstadt, Little Ferry, Lodi and Moonachie firefighters provided mutual aid.
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