A security guard at a local school district has been taken into custody over pornography charges.

According to WNEM, Grand Blanc Superintendent Dr. Norm Abdella posted a message to the district's website on Friday in which he explained the incident. Abdella says a flash drive was discovered on the campus of the East High School containing both adult and child pornography. Authorities believe the drive belonged to a second shift security guard who may have left it there over winter break. Abdella says parents weren't notified immediately because it didn't directly involve students or teachers and they didn't want to alert the suspect.

Click here to see the superintendent's full letter.