The United States on Wednesday expelled a Taiwanese exchange student who had allegedly threatened to "shoot up" his school. An-Tso "Edward" Sun, 18, was arrested last March after another student reported that he told him he planned to open fire in the school in Upper Darby, on the edge of the northeastern city of Philadelphia.
"Hey, don't come to school on May 1st ... I'm going to come here armed and shoot up the school. Just kidding," Sun told the other student, according to prosecutors. When police searched the room that Sun had been occupying with his host family, they found a semi-automatic pistol and 20 rounds of ammunition, as well a crossbow, arrows, and a bullet-proof vest, helmet and pants.