The mass shooting in San Bernardino, California, on Wednesday was the sixth mass shooting to take place this past week. In fact, this year, there have been more mass shootings — defined as incidents in which four or more victims are shot — than days in the calendar year, NBC News reported.
The U.S. has seen 355 mass shootings so far in 2015, according to ShootingTracker.com, which tracks deaths by guns in America.
The San Bernardino shooting, in which 14 people were killed and 17 others injured, is the deadliest mass shooting in the U.S. since the Sandy Hook elementary school massacre in Newtown, Connecticut, three years ago, which claimed the lives of 26 people.
