Puyallup police late Sunday detained a Kalles Junior High School student who allegedly made threats against the school, the department announced.
School continued as scheduled Monday throughout the Puyallup School District.
Police learned of the threat about 4:50 p.m. Sunday when a student saw the threat on social media and told his parents, who called police.
A detective and an officer determined an eighth-grader at the school made the threat. The student was arrested about 8:45 p.m.
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Parents were informed of the threat, police said.