Seems there isn't really an official definition and that apparently complicates things in the way the media reports.
Quote:
One strict definition used in the past by the federal government says at least four victims must be killed. Much broader criteria requires at least four victims be injured, though not necessarily killed. Other definitions land somewhere in the middle.
See related rulings
There’s no legal definition, and as prominent gun violence researcher Garen Wintemute of the University of California at Davis told us, "there isn’t a right and wrong here."
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