Students file into the adjacent National Guard armory following a shooting at Dixon High School Wednesday, May 16, 2018, in Dixon, Ill. A 19-year-old who showed up at his former high school in northern Illinois and opened fire on a police officer working there, was shot by the officer and taken into custody. The officer, who was not injured, was hailed a hero for his quick response protecting students and staff who had gathered at Dixon High School for a graduation rehearsal. (Alex T. Paschal/Sauk Valley Media via AP)
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