San Bernardino Massacre Is Deadliest Shooting Since Sandy Hook

The mass shooting in San Bernardino, California, on Wednesday is the deadliest since the 2012 massacre at Sandy Hook Elementary School in Newtown, Connecticut, according to Everytown for Gun Safety, an organization that advocates gun control.

Wednesday's shooting killed at least 14 and wounded 14 more, when as many as three gunmen stormed the Inland Regional Center, which assists individuals with developmental disabilities.

The mass shooting was the 355th in the U.S. this year-- more than one per day.

In December 2012, gunman Adam Lanza killed his mother at her home and then stormed the Sandy Hook school, killing 20 children and six adults before killing himself.

Read more about the San Bernardino shooting here .

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