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PHILADELPHIA (CBS/AP) — A Taiwanese exchange student accused of threatening to “shoot up” his Delaware County high school has been spared additional time in prison but will be deported. An-Tso Sun has been in custody since March after local authorities were alerted to a threat he had made against Monsignor Bonner-Archbishop Prendergast High School.

The 18-year-old student called the talk a joke, but authorities found more than 1,600 rounds of ammunition, as well as weapons, in the home of his host family.

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A federal judge Monday declined a prosecution request to sentence him to two or more years in prison for his guilty plea to a firearms-related charge but ordered his deportation. He agreed to the deportation as part of a plea agreement.

The judge cited his youth and a strong family support system. Sun’s parents are actor and assistant film director Sun Peng and actress Di Ying.

(©Copyright 2018 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)