Add Yahoo as a preferred source to see more of our stories on Google. Mourning and outrage have shaken the nation as mass shootings continue to mark some of the latest chapters of a long history of ...

Wednesday’s massacre in San Bernardino was the latest mass shooting in America. By some counts — including a heavily cited version — it was the 354th of the year. By a narrower definition, it was the ...

There is no universal standard for what constitutes a mass shooting, potentially causing discrepancies in data and research among authorities and experts -- and confusion for the average person. "Some ...