There is not one standard definition across the US for "school shooting" but this is one that it seems is most used
It defines school shootings as
situations when someone brandishes or fires a gun on school property or a bullet hits school property for any reason, regardless of the number of victims, time or day of the week, or motivation.
A gang shooting at 2am on a Saturday would somehow constitute a "school shooting" by this standard. Easy to see using this metric how the numbers can easily get skewed, especially when it comes to schools in high crime areas.
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