You can see the data here and here. It appears likely that, as with homicide generally, the overwhelming majority of these extra homicides were intraracial, just as the overwhelming majority of the extra homicides of whites were likely intraracial.
Naturally, I very much support preventing unjustified police killings of blacks (and of whites and of others). But of course I’d like to see that happen together with a reduction of the vastly largely number of unjustified nonpolice killings of blacks (and others), rather than together with a sharp increase in net homicides.
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