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 ...

In recent years, it seems Western Pennsylvania has seen more than its fair share of mass shootings. • LA Fitness in 2009. • Western Psych in 2012. • Wilkinsburg in 2016. • Tree of Life in 2018. • ...

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 ...

There is no consensus among organizations that track shootings in the U.S. about the definition of "mass shooting" Twenty-one shot dead in Uvalde, Texas. Ten in Buffalo, N.Y. Four in Tulsa, Okla.

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 ...