Another threat at Fond du lac High School. On Tuesday, March 14th, in the late afternoon, Fond du Lac High School discovered a note that appeared to be a threat that would occur at the school on the following day (March 15th). Following the school’s emergency crisis plan, local law enforcement was notified and an investigation was initiated. Law enforcement and school administration did not deem it as a credible threat. An increased law enforcement presence on March 15th was planned in order to address any safety concerns.