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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.
THREE SHOOTERS? 3 lone ‘disgruntled worker’ gunmanzzzzz, each of them acting out alone coincidentally on the same day as the other two. Yeah, I’ll buy that. LOL