BALTIMORE COUNTY — Parkville High School was placed on lockdown after a student was found with a gun on campus, officials say.

School officials were investigating the report of a smell of marijuana and discovered a student was in possession of a gun.

School resource officers were quickly contacted and lockdown was activated at 11:30 a.m.

When a school is on lockdown, no can enter or leave the building without the principal's permission.

The student fled the building before he was quickly arrested.

Lockdown was lifted 15 minutes later.

In a letter sent out to the school community it says, "Dangerous and disruptive behaviors will not be tolerated at Parkville High School. Please speak with your child(ren) and remind them that harmful choices and disruptive and dangerous behaviors have

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