American Red Cross:  www.redcross.org

Federal Emergency Management Agency:  www.fema.gov

Hamilton Fish Institute for School and Community Violence:  www.hamfish.org

International Association of Chiefs of Police (IACP):  www.iacp.org

International Critical incident Stress Foundation:  www.icisf.org

U.S. Department of Education:  www.ed.gov

U.S. Secret Service National Threat Assessment Center:  www.treas.gov/usss/ntac