• S Kostinsky, E O Bixler, and P A Kettl.
• Department of Psychiatry, Penn State College of Medicine, Mail stop MCH073, 500 University Dr, Hershey, PA 17033, USA.
• Arch Pediat Adol Med. 2001 Sep 1; 155 (9): 994-1001.

BackgroundFollowing the April 20, 1999, massacre at Columbine High School, Littleton, Colo, school administrators, law enforcement officials, and the media reported a rash of successive bomb threats and threats of school violence that were attributed to imitation.ObjectiveTo establish that the clustering of threats of school violence following the Columbine massacre was initiated by imitation.DesignA database of threats of school violence reported to the Pennsylvania Emergency Management Agency, Harrisburg, during the 50 days following the Columbine incident was examined to determine the daily frequency of threats. To determine factors that predict the occurrence of these threats, counties and school districts in which threats occurred were noted.ResultsPennsylvania school districts reported 354 threats of school violence during the 50 days after the Columbine massacre, far exceeding the 1 or 2 threats per year estimated by school administrators before 1999. The frequency of these threats over time demonstrated a crescendo-decrescendo pattern. Fifty-six percent of the threats were made on or before day 10 after the incident, and more than one third occurred on days 8, 9, and 10. Factors that predicted the likelihood of a school's receiving a threat after the massacre included a greater proportion of white students and larger school enrollment.ConclusionsSuccessive threats of violence follow a publicized act of school violence. The media should recognize that imitation threats can occur and craft their stories accordingly.

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