The incident happened shortly after 2:30 p.m. at 890 Cauldwell Avenue in the Morrisania section.
Preliminary, police say a 14-year-old boy was stabbed once in the back with an unknown sharp object inside the basketball court at the location.
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The suspect is described as a man wearing a dark coat, blue pants and gray sneakers, who fled westbound on East 163rd Street.
The victim was taken to Harlem hospital and is expected to survive.
This is breaking news. This story will be updated as more information becomes available.
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