Study found that 7% of Americans have been present at a scene of a mass shooting and 2% had been injured in one

One in 15 Americans has witnessed a mass shooting, a new study shows, revealing the depth and impact of the epidemic of gun violence that has washed over the US in recent decades.

The study found that about 7% of US adults have been present at the scene of a mass shooting in their lifetime, and more than 2% have been injured during one, according to new a report from the University of Colorado Boulder.