Windsor High School was placed in lockdown Thursday morning after a student brought what was initially believed to be a gun to school.
Police responded to the school just before 11 a.m. after getting a report that a male student had a gun in the bathroom.
The 16-year-old student was located and detained. It was determined the student had a fake gun on him.
He was arrested and charged with second-degree breach of peace and turned over to a parent, according to police.
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No one was injured, and the lockdown was lifted after about 30 minutes, police said.
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