Dundee-Crown High School administrators received an anonymous call Wednesday morning that a threat was made to harm a teacher, Community Unit School District 300 said in a statement. The Carpentersville Police Department responded to the scene and worked with the district to investigate the threat. “Carpentersville police personnel will maintain an increased visibility in and around Dundee-Crown High School today and Thursday, as a precaution based on the anonymous call,” Police Chief Michael J.