It happened just before 3:30 p.m. Wednesday in Hackensack.
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Police say the victim was using the fax/copy machine when another woman approached to use a nearby machine with her own mask pulled below her mouth.
The victim told her to wear her mask, and the suspect became angry and started yelling.
Raw video of attack:
Woman assaulted in NJ Staples in dispute over mask
She approached the victim, who raised her cane and pointed it directly at the suspect, coming within inches of her chest.
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The suspect then grabbed the victim, violently threw her to the ground, and left the store.
The victim was transported to Hackensack University Medical Center with a broken leg.
No arrests have been made
Hackensack police are asking anyone with information or who may be able to identify the attacker to contact CrimeStoppers at 844-466-6789.