The incident happened around 12:30 p.m. on the 1400 block of Master Street.
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Officials say a male suspect pulled a gun and tried to rob the store.
That's when a customer inside the store reportedly shot the suspect twice in the abdomen.
Police originally stated the owner of the store fired the shots at the would-be robber.
The customer is licensed to carry, according to officials.
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The suspect was rushed to Temple University Hospital by police, where he died from his injuries.
Officials say a second armed suspect managed to escape during this incident.
Anyone with information is asked to contact police.