Investigators are seen at a schoolhouse where a gunman went on a rampage, killing at least three girls and himself. (Matt Rourke / AP)
A horse and buggy passes a police car near a schoolhouse in which, police say, a gunman killed several people. (Matt Rourke / AP)
State Police Commissioner Jeffrey B. Miller during a press conference in Nickel Mines, Pa. (Matt Rourke / AP)
