A 15-year-old died and an 11-year-old hospitalized in the incident, which responders said occurred just before 11 a.m. in a Park Avenue apartment building around the corner from Barringer High School, they said.
The younger victim's injuries weren't considered life-threatening, responders said.
The Essex County's Prosecutor's Office and Newark police were investigating. The Essex County Sheriff's Bureau of Criminal Identification collected evidence.
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