Mass shootings in U.S. history

Published On: Jul 20 2012 07:20:30 AM PDT   Updated On: Jun 13 2016 10:16:38 AM PDT
Pulse Nightclub scene

With 49 victims, Sunday's terrorist attack at an gay nightclub in Orlando now ranks as America's most deadly mass shooting. Take a look at some of the other worst mass shootings in U.S. history.