Police searched Crosby Elementary in Harvard Monday morning after a custodian found a used shell casing from a bullet.
Administrators were already planning a walk-through of the Harvard Community School District 50's buildings after the recent school shootings in Connecticut.
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The discovery of the shell casing in the school's cafeteria prompted school leaders to do a more comprehensive inspection with the Harvard Police Department, said Superintendent Lauri Tobias in a statement.
Students stayed in their classrooms and continued on with their day.
Nothing was found and everyone was safe, Tobias said.