Well, with THREE shooters, the American Pravda Press will be QUITE quick to rule out terrorism!
What difference does it make?
Well I am going with Syria on this one as the nugget at the heart of it.
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Yes, they are three independent shooters who coincidentally decided to shoot up the place in a case of "work place violence".
Each of the shooters were unaware of the other two - they just had had enough of the workplace to snap and shoot simultaneously.