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Blue Icons represent a responsible defensive gun use in which a person protected him/herself and/or less than four other people

Yellow icons represent an instance where a responsible defensive gun use likely prevented the death or serious injury of four or more people

Red icons represent massacres that have occurred either with a gun in a country/city/area where guns are prohibited or with some other weapon besides a gun (for definition purposes, a massacre is an instance where four or more people are murdered based on a random selection in a relatively  close area or time)