What is the definition of a mass shooting?

Krodwhodat said

No my point was we hear crazy numbers like there were over 300 mass shootings in x amount of time and I wonder if these were counted. Like there were 34 people shot over Labor Day weekend in Chicago. Just wondering how we get to these large mass shootings.

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In that case, wherever you are getting that number I'm sure they provide their own definition or source, or you can contact whoever published it to give you their source.

However, I'm sure going into a church and shooting everyone in it simply because they were "black", or opening fire on any large gathering simply because they are there, deserves it's own category.