The incident happened around 3 p.m. at 2819 Mermaid Avenue in Coney Island.
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Police say a 17-year-old boy was chased by a group of kids who eventually caught up with the victim and began to attack him.
One of the suspects then took out a knife while the others continued to attack and stabbed the victim in the back.
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Authorities say the victim walked into a nearby business for help. That business then called 911.
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The victim was taken to Maimonides in critical condition.
No arrested have been made and the investigation is ongoing.
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