By GRETCHEN EHLKE Associated Press MILWAUKEE (AP) — A 17-year-old told investigators that he fatally shot his grandparents and was planning to cause harm at his eastern Wisconsin high school, police said Monday. Police officers responding to a 911 call for assistance found the bodies of 74-year-old Dennis Kraus and 73-year-old Letha Kraus at their home in Grand Chute about 11:30 a.m. Sunday, Officer