PA Exchange student built gun from parts bought online

An Tso Sun, an exchange student from Taiwan, was arrested last week and charged with terrorist threats with the intent to terrorize another, according to Upper Darby Police.

Police Superintendent Michael Chitwood said Sun bought the parts for the firearm online and “put it together” himself.

“It was a weapon capable of firing,” Chitwood said.

Police have announced new developments regarding the student arrested last week for allegedly threatening to shoot up the Bonner Prendergast high schools.

Upper Darby Police now say the teenager also had a gun, and more than 1,600 rounds of ammunition.

On the day of his arrest, Sun’s host mother, who has not yet been identified, allegedly packed up the ammunition and the weapon, and gave them to another person, Chitwood said.

“She went back to the house and loads all the ammo and the gun into a black bag. She then takes that to another person at another location,” Chitwood said, “She didn’t give it to the police.”

Investigators recovered the objects last Thursday after receiving a tip. Chitwood did not say where they found them.

The host mother has not been charged.