Multiple incidents of violence against youths occur yearly. In addition, dramatic instances of mass violence toward youths have changed over the past 2 decades. In the 1970s and 1980s, highly publicized shootings and hostage takings of children in the United States were most often committed by intruding adults (e.g., the Chowchilla school bus kidnapping; armed attacks on elementary schools in Chicago, Los Angeles, and Stockton, California, and on a fast-food restaurant in San Ysidro, California; a hostage taking and suicide in Orange, California; and a hostage bomber in Wyoming). In the 1990s, highly publicized events were more often committed by students shooting other students (e.g.,