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...is when four or more people are shot in an event, or related series of events, likely without a cooling off period.
http://shootingtracker.com/wiki/Main_Page
The FBI has defined "mass murder" to be 4 or more murders within a single event. When shootings occur, and there's plenty of them, when one person fires and hits 4 or more people in a single event or series of related events, there's a "mass shooting". In the US IIRC there's around 10,000 murders by firearm per year and probably 3 or 4 times that number of woundings. It does stand to reason that, with around 150 people shot per day, at least a few will be shot in the same place by the same dude.
I'm not seeing anything news worthy here. 
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