An incident in Butler County forced the lock-down of a school for a short time Wednesday morning (May 30, 2018).

Access to North Butler Junior/Senior High School in Greene was restricted for about 40 minutes due to a potential "outside threat", District Superintendent Joel Foster said in a Facebook post. According to Foster, sheriff's officials notified school personnel about the situation around 10:30 AM.

"The building was immediately placed in lock-down to restrict access, and all students who were working outside were brought into the building," Foster wrote. "Within minutes, a deputy from the sheriff’s department arrived on scene as an extra precaution."

Foster said sheriff's officials quickly located the subject, and normal operations at the school resumed around 11:40 AM.

Butler County sheriff's officials haven't yet released any information on the incident that caused the lock-down.