A bomb threat at Oak Harbor Middle School prompted a full search of the district's buildings Monday afternoon.
According to the Ottawa County Sheriff's Office, a threat came in to the middle school prior to the end of classes.
All students were sent home safely and all after-school activities have been cancelled.
Officials are search all school buildings for evidence of a threat.
Students at Sandusky High School are also safe Monday after a threat was made at their school building. The unspecified threat came in some time in the afternoon.