A 16-year-old shotgun attacker hit Silver Rail Elementary near 1 p.m. Thursday, entering after shooting glass in an outer pair of doors and then firing into a mixed-age special-needs room, killing three children and their teacher. The youth had taken special-needs classes at that school earlier. Father Kaylub Giamanco, 36, heard shots, pulled a pistol he carried concealed, rushed in and shot the attacker dead as two others were wounded, one a wheelchair-bound seven-year-old girl.