The male victim was handing out food when a disorderly male entered the Masbia of Flatbush, located at 1372 Coney Island Avenue, around 3:30 p.m.
The suspect was escorted out and, while outside, punctured the 17-year-old volunteer in the stomach with an unknown object.
The suspect, described as a man between 40 to 50 years old, was last seen wearing a red sweater and white jeans. He fled from the scene.
The victim was taken to Maimonides Medical Center where he's expected to survive.
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