Police in Valparaiso say a seventh grader from Thomas Jefferson Middle School was arrested after school officials found a large knife inside his locker. School officials say they learned a seventh grader was in possession of and had been displaying a dagger on the school bus. A school official accompanied with a school resource officer searched the locker of the seventh grader. Police say school officials spoke with the student and received conflicting explanations for why the student allegedly brought the knife to school. The student was arrested Friday and charged with Possession of a Knife on School Property, a Class B Misdemeanor, and taken to the Porter County Juvenile Center.