It happened on Southern Boulevard and East 149th Street in the Longwood section Monday afternoon.
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Police say the suspect ran into the business and took a swing at the victim but missed. He then swung a second time, slashing him in the left arm.
The man then ran back outside and hopped into a dark-colored BMW that fled the scene.
The victim was taken to Lincoln Hospital with a non-life-threatening injury.
The FDNY says three other people were transported to the hospital with unknown injuries.
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It is believed the suspect and victim know each other, and sources tell Eyewitness News this is an ongoing dispute over money.
So far, there are no arrests.
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