Passaic police received a call at 5:45 p.m. Saturday about a man running around the area of 593 Main Avenue with a gun following a robbery.
Authorities say the suspect, wearing a ski mask, used a giant rock to smash the front window of Ray's Jewelry at 616 Main Avenue and fled on foot with four gold chains valued at about $27,000.
As he left, the suspect reportedly fired multiple gunshots in the air.
There were no reported injuries, and the suspect has not been arrested.
The investigation is ongoing.
Anyone with information should call the City of Passaic Police Department's Detective Bureau at 973-365-3938 or the Shift Commander at 973-365-3900.
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