Roseburg, Oregon shootings: How common are such attacks?
The killing of nine people in an Oregon college is the 294th "mass shooting" in the US this year, according to one definition of such tragedies.
The 26-year-old gunman opened fire at Umpqua Community College in Roseburg on Thursday morning and was killed in a police shootout.
But how often do such attacks take place?
BBC Washington correspondent Rajini Vaidyanathan has been finding out.
Video journalist: Andrew Webb
Nine dead in US college shooting
Police audio courtesy of Broadcastify.com