PA “Exchange Student” Arrested After Threat To “Shoot Up” Upper Darby School Reveals Weapon

Upper Darby police arrested Taiwanese exchange student, An Tso Sun, after he was accused of threatening a shooting at Monsignor Bonner and Archbishop Prendergast High School.

Sun, 18, was later found to be in the possession of live ammunition, military-style ballistic vest, ammunition clip pouches and a high-powered crossbow. A computer in the bedroom of the Lansdowne, Pennsylvania home where he was staying showed he also researched “how to buy AK-47.”

Upper Darby police alleged Wednesday that 18-year-old Taiwanese exchange student An Tso Sun threatened to “shoot up” the Monsignor Bonner and Archbishop Prendergast High School on May 1. Sun later said he was joking but was charged with making terroristic threats. source

Sun’s assigned public defender said his client “had no intention or plans” to commit a school shooting, and many items found were things he wore to school for a “Halloween costume contest.”