Ontario police said officers arrived to the mall around 1:45 p.m. after reports of a disturbance and were investigating if a crime happened.
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They determined a group of people ran through the mall, causing panic among shoppers.
"Ontario Dispatch then received multiple calls claiming a person had a gun and gun shots were heard. It has been determined that there was no gun or shots fired," Ontario police tweeted.
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The police department said it will investigate the false claims and hold any suspects accountable.
Police said the mall remains open and is safe.