Law enforcement personnel stand outisde the Delaware Valley Charter School Friday, Jan. 17, 2014, in Philadelphia. Police say up to three boys may have been involved in the shooting of a couple of fellow students in the gym at the school.

Matt Rourke / AP

Law enforcement personnel stand outisde the Delaware Valley Charter School Friday, Jan. 17, 2014, in Philadelphia. Police say up to three boys may have been involved in the shooting of a couple of fellow students in the gym at the school.