In July, we created a map showing the locations of the year's mass shootings to that point. That map used data collected by ShootingTracker.com, a crowd-sourced project attempting to catalog incidents in which four or more people were injured or killed by gunfire -- a broader definition of the term "mass shooting" than the one used by the federal government.
In light of Wednesday's shooting in San Bernardino, Calif., we decided to update that map. Below: All of the shootings through Dec. 2 (as of 1 p.m. Pacific/4 p.m. Eastern).
The yellow circle is San Bernardino, sized to initial, unconfirmed reports of the victims so far. (The San Bernardino Fire Department has said there are believed to be at least 20 people injured in the shooting.) The blue circles are those in which people were killed; outlined circles are the number injured.
There have been incidents that meet the ShootingTracker standard in 46 states and in D.C. Florida, Illinois and California have had the most incidents. In each state, there have been at least 22 shooting incidents in which four or more people were shot.