(The video in the player above is from previous coverage.)
Police say a 17-year-old boy turned himself in Friday night. He is facing 13 counts each of aggravated assault, simple assault, and recklessly endangering another person, along with related offenses.
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The shooting happened Wednesday at the Christy Recreation Center. Surveillance video shows the alleged gunman and several others arriving at the scene and fleeing after shots were fired.
Investigators believe a fight may have preceded the shooting.
Two children, two 16-year-olds and a rec center employee were injured. A 16-year-old remains in critical condition.
Anyone with information is asked to contact police at 215-686-TIPS.