Among the injured is a 13-year-old, who is in extremely critical condition, CNN reported quoting the Mercer County Prosecutor's Office.
Police are investigating to determine if there were more suspects.
"Multiple weapons have been recovered," prosecutor Angelo Onofri said. "Twenty individuals were treated for a variety of gunshot wounds as well as other injuries."
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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