Police say an unexpected lockdown today at South Lyon High School was the result of a system malfunction.

The South Lyon Police Department responded to the high school this morning following the activation of a building lockdown. A memo from South Lyon Community Schools' administration to parents and students states that the lockdown was not a planned drill.

After receiving a number of calls regarding their response to the school, the South Lyon Police Department issued a statement indicating that a system malfunction triggered the unscheduled lockdown. The school’s administration, officers from the South Lyon Police Department and deputies from the Oakland County Sheriff’s Office performed a systematic check of the building room by room and did not find any issues, problems or threats, deeming it secure.

Further details regarding the cause of the system malfunction have not been released. (DK)