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Unclassified <br />As expected, therefore, many incidents ended before police arrived." Of the 160 <br />incidents, at least 107 (66.9%) ended before police arrived and could engage the shooter, <br />either because a citizen intervened, the shooter fled, or the shooter committed suicide or <br />was killed by someone at the scene. <br />Casualties <br />A total of 1,043 casualties occurred during the incidents included in this study (486 killed, <br />557 wounded). If a shooter died as a result of the incident, that individual was not included <br />in the casualty totals. In addition, a small number of those identified as wounded were not <br />injured by gunfire but rather suffered injuries incidental to the event, such as being hit by <br />flying objects/shattered glass or falling while running. For the purposes of this study, the <br />FBI did not seek to isolate the exact number of individuals that fell into this category, when <br />research did not allow for that type of injury to be easily discerned. <br />The median number of individuals killed in each incident was 2, and the median number of <br />individuals wounded in each incident was 2. <br />The FBI found that 64 incidents (40.0%) would have been categorized as falling within <br />the new federal definition of "mass killing," which is defined as "three or more killings in <br />a single incident."19 <br />A Study of 160 Active Shooter Incidents in the United States Between 2000 - 2013: <br />Annual Totals of 1,043 Casualties <br />250 <br />200 <br />150 <br />100 <br />50 <br />2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 <br />18 According tothe 2007 National Crime Victimization Survey,53.4%ofthetlme, law enforcement was able to respond too reportedviolent <br />crime in less than 10 minutes. Bureau of Justice, National Crime Victimization Survey, Criminal Victimization in the United States, 2007 Statistical <br />Tables, February 2010, <br />19 Investigative Assistance forNnlent Crimes Actof 2012, 28 USC 530C(b)(1)(M)(i). <br />Unclassified <br />