Firstly, whites, whose number is approximately five times the number of blacks, commit 1 million inhabitants of the entire US population on average about one and a half times fewer murders than blacks. Secondly, white killings are distributed relatively proportionally between different demographic groups. In contrast, the black killings obviously concentrate on the representatives of their racial group.
These statistics are confirmed by the distribution of the number of murders committed by African Americans by racial groups. Almost 82% of the murders committed by black killers were carried out against representatives of their own racial group.