Police were called to the incident at Liberty Ave and Ryan Street around 3 p.m., Chief Vincent Ricciardi said. Due to the proximity of the incident to the school, and that students were still inside, a school lockdown was ordered.
A shell casing and other evidence were recovered, along with a gun around 5 p.m., when the lockdown was lifted.
The shooter was identified as a 17-year-old boy from Bloomfield, police said. A 17-year-old boy from Irvington and 19-year-old man from Hillside were also arrested.
The Union County Sheriff's K-9 and crime scene units assisted
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