The Missouri State Highway Patrol Bomb Squad Division was called to Smithton High Elementary School to investigate a suspicious device there.
At 8:30 a.m, the device was found in the school's principal office, and the school went on lockdown immediately.
The device was reportedly found and removed by Diedrck Kahrs, the school's superintendent.
At 11:00 a.m, the lockdown ended. No one was hurt and class is now in session as normal.
A Pettis County Sheriff Office official told KRCG\ that they had no arrests during the incident, and they received reports that the item was similar to a World War II-era ammunition shell casing.
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