- Mass killings occur in USA once every two weeks. Analysis of FBI records from 2006 to 2010 shows that a mass killing occurs on average, every two weeks. It defines mass shooting as the FBI does, as one in which at least four people are murdered. http://www.usatoday.com/story/news/nation/2012/12/18/mass-killings-common/1778303/ 4 comments politics
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