It happened around 4 p.m. Saturday near Algonquin Street and Davenport Drive.
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Police say two armed men smashed their way into the business and tried holding up the owner.
The owner, however, was also armed and shot at the suspects in self-defense, police said.
The would-be thieves managed to escape unharmed and fled the scene.
Police said a customer who was inside the store at the time was cut by broken glass, but no other injuries were reported.
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A detailed description of the suspects wasn't immediately released.
The incident remains under investigation.