The shooting happened at Great Savings on Jamaica Avenue on Saturday, just after 5 p.m.
Police say the suspect left the store but returned and opened fire.
A 34-year-old worker was shot in the chest and was taken to the hospital in critical condition.
A 55-year-old worker was struck in the leg. That employee was listed in stable condition.
The suspect is described as a man, approximately 6 feet tall, wearing gray sweatpants and a green sweater.
No arrests have been made.
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