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September 24, 2014]

But I wanted to know what the racial breakdown of these shootings is, in terms of race of shooters and victims.

Well, here is absolutely all that the FBI has to say about that:

The shooters victimized young and old, male and female, family members, and people of all races, cultures, and religions.[PDF p. 8]

Otherwise, there is no mention of the race of the shooters, the race of the victims, or any racial motive they may have had.