BOUNDARY COUNTY, Idaho - All schools in the Boundary County School District were closed Monday morning after a bomb threat was called into 911 dispatch. The threat did not name a specific school, so after conferring with law enforcement, the decision to shut down all five schools in the district was made by the Superintendent. Law enforcement, including the Border Patrol, were called in to search all five buildings, however nothing was found. The Superintendent told KHQ Monday afternoon that this is the ninth bomb threat in the district since May 2012. Most of the threats were made by writing on bathroom stalls, however prevention methods such as bathroom monitors, meetings with law enforcement, students, and attorneys has seen the number of threats at schools go down. Monday morning's threat however came via telephone. All schools in the district will be open on Tuesday.