The suspect, whose name was not released because he is a juvenile, was arrested near his car a half-mile away, the FBI said. He was not immediately charged.
FBI officials would not comment on a motive. And Police Chief Tim McKenna said authorities “have a lot of homework to do yet” in their investigation. But 15-year-old Danny Komertz, who witnessed the shooting, said the gunman was known as an outcast who had apparently been bullied.