FILE – This undated photo provided by the Upper Darby Police Department in Upper Darby, Pa., shows An-Tso Sun, a Taiwanese exchange student arrested for threatening a shooting at his suburban Philadelphia high school, Monsignor Bonner and Archbishop Prendergast Catholic High School in Drexel Hill, Pa. Sun pleaded guilty to a federal firearms charge Tuesday, Aug. 28, 2018, during a federal court arraignment. Sun previously pleaded guilty to state terroristic threat charges and was sentenced to four to 23 months. (Upper Darby Police Department via AP, File)
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