It happened around 2 p.m. on the 800 block of Granite Street.
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Police say the 47-year-old male clerk was unloading soda bottles outside of the business when an argument ensued.
The victim was shot one time in the left armpit. He was taken to Albert Einstein Medical Center in critical condition.
Action News spoke with Frank Rosario, who is a member of the Dominican Grocers Association. He said members of the organization rushed to the scene and want justice for the injured clerk.
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No arrests have been made.
Anyone with information is asked to call police at 215-686-TIPS.
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