PINE CITY, Minn. (WCCO) — Police say a 15-year-old brought a cylinder-powered BB gun with a replica silencer screwed onto the end to Pine City High School on Thursday.

The Pine City Sheriff’s Office said a student reported seeing it and told staff. As the school went on lockdown, the 15-year-old was isolated with a staff member. The pistol was found in the boy’s bag, but didn’t have any BBs in it, according to authorities.

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The magazine was empty and there was no air cylinder in the weapon, police say.

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The boy is a student of the school and wasn’t belligerent with staff.

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He was booked into juvenile jail and is still in custody. He will be charged with a gross misdemeanor, police say.