An 18-year-old exchange student from Taiwan was arrested Tuesday night for allegedly "threatening to shoot up" a Pennsylvania high school, local police said.

According to the Upper Darby Police, the suspect, An Tso Sun, had a slew of items in his home including: a military-style ballistic vest; high-powered crossbow with scope and light; arrows; 29 rounds of 9mm ammunition; a strangling device; a "military" ski mask; and ear protectors for firing.

Authorities also found a school-issued iPad that allegedly showed Sun was searching weapons like AK-47s and AR-15s, Yahoo News reports..

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