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Oswego High School was on lockdown for a short time Thursday morning after a plastic replica weapon was found in a student’s locker.

The school was placed on lockdown at 8:31 a.m. The lockdown was lifted at 8:38 a.m.

A school resource officer searched a locker at the school and found a plastic replica weapon used in airsoft sports activities, according to a press release from the Oswego Police Department.

School officials were told that the replica weapon was not a threat to the safety of students, according to a District 308 press release.

School officials said the item was found in a student’s backpack in a locker. Once the lockdown was lifted, students resumed with the regular daily schedule, according to the district press release.

Police and school authorities are conducting an investigation into the incident.