Mass killers target Americans once every two weeks on average, in attacks that range from robberies to horrific public shooting sprees like the massacre Friday of 27 people in Newtown, Conn., a USA TODAY examination found.
Using news accounts and FBI records from 2006 through 2010, the most recent years for which complete records were available, USA TODAY identified 156 murders that met the FBI definitions of mass killings, where four or more people were killed.
All told, the attacks killed 774 people, including at least 161 young children.
The review offers perhaps the most current, complete picture yet of a crime that is both frighteningly common and not widely understood.
h/t USA Today
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