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San Bernardino shooting has most mass-shooting fatalities since Sandy Hook

There has only been one seven-day period with no mass shootings since 2013, crowdsourced data shows

The San Bernardino shooting, which killed 14 people and wounded 17 others, came less than a week after a man killed three people and wounded nine in a shooting rampage at a Planned Parenthood clinic in Colorado Springs, Colorado. In October, a gunman killed nine people at a college in Oregon, and in June a white gunman killed nine black churchgoers in South Carolina.

But the frequency of the recent large-scale gun attacks isn't an outlier. According to a crowdsourced database of mass shootings (defined here as an event where four or more people are wounded or killed by bullets), since 2013 there has been only one seven-day period without any mass shootings — April 8 to 15, 2015. 

Still, the number of mass shootings to date this year has already exceeded the totals to date for each of the previous two years, and the San Bernardino shooting — which has had the largest number of fatalities in a mass shooting since Sandy Hook in December 2012 — brings the number of mass shootings this year to 353.

Mass shootings have occurred every week but one in 2015
Year Shootings
As of Dec. 3, 2015 353 shootings
On this date in 2014 310 of 336 mass shootings
On this date in 2013 342 of 363 mass shootings
Source: Mass shooting tracker
Note: Mass shooting tracker defines a "shooting" as an event in which at least four people are struck by bullets. Current as of Dec. 3, 2015.

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