Mass shootings in the U.S.: 275 mass shootings have occurred in 2017 so far

A quadruple homicide in Casa Grande can be considered a mass shooting, marking the 275th so far this year.

According to data from the Gun Violence Archive, a total of 275 mass shooting incidents have occurred as of October 5, including Sunday's deadly attack in Las Vegas and Thursday's incident in Casa Grande.

Comparatively, 2016 saw a total of 483 mass shootings. See statistics for other years here.

READ MORE: 59 people killed, over 500 injured in Las Vegas on Sunday

There doesn't seem to be an official definition for a "mass shooting" in the United States, but according to the Gun Violence Archive, a mass shooting is described as four or more individuals being shot or killed in the same general time and location. 

Since 4 people were shot and killed in Thursday's Casa Grande incident, it fits this definition.

The F.B.I. has defined "mass killing" and "mass murderer".

The F.B.I. defines a "mass killing" as the killing of three or more people in a public place, but the federal agency also defines a "mass murderer" as someone who has killed four or more people in the same location.

The Gun Violence Archive lists itself as a not-for-profit organization that documents gun violence and gun crime nationally.

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