ST. PAUL, Minn. (AP) -- School officials in St. Paul have issued a letter reminding parents and students to keep their iPad cases clean after bed bugs were discovered in five of the devices.

The letter was sent to all middle and high school families and gave instructions on cleaning the devices.

School district spokesman Kevin Burns says the iPads in question were found at Como High School.

The iPads were distributed to students at the start of the school year.