One woman said her son ducked into a bathroom after he heard what sounded like a gunshot, then joined others running from the building after a Shake Shack manager urged him to flee.
"Police were pulling up as he left," she said.
Paramus Police Chief Kenneth Ehrenberg confirmed the jewelry smash and grab. A report of shots fired was "bogus," he said.
Initial details were sketchy.
A vehicle involved in the incident -- believed to be a Honda Civic -- fled the scene with three occupants, responders said.
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