As another mass shooting plagues the world, we take a look at the timeline of events of the latest as well as the deadliest shootings in the U.S. in the last 20 years.
The San Bernardino, California shooting at the Inland Regional Center that services people with developmental disabilities is the latest in a string of recent mass shootings and attacks in the United States and worldwide.
AP GALLERY: Photos from the scene
TIMELINE: Mass shooting at SoCal social service center
TIMELINE: Deadliest shootings in the U.S. in the last 20 years