307 mass shootings have occurred in the US so far in 2017

A church shooting killing at least 26 in Sutherland Springs, Texas marks the 307 mass shooting in the United States so far this year.

According to data from the Gun Violence Archive, a total of 307 mass shooting incidents have occurred as of November 5, up 27 from one month ago.

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

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. 

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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