According to police, the incident happened Sunday around 11:30 a.m. when a woman bumped into a person and exchanged words about social distancing.
That's when police say the woman yelled, "(expletive), I don't have the virus." She then allegedly pulled down her mask and spit on the person before fleeing the scene.
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The victim was wearing a protective mask and glasses at the time.
A store employee told police the suspect had another altercation the day before in which she allegedly spit on him after a dispute over how she wanted to pay for items.
The woman is described as 30 to 35 years old, 5-foot-6-inches tall, thin build, with long reddish-brown hair. She was last seen wearing a three-quarter length black jacket, dark pants and a red bandana around her neck.
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Anyone with any information is asked to call police at 215-686-TIPS.