The Bureau of Justice Statistics has released a report on homicide trends in the United States between 1980 and 2010

The report says that most murders are intra-racial (i.e. both the victim and the offender are of the same race) - the victimization rate for blacks was 6 times higher than for whites, while the offending rate for blacks was almost 8 times higher than the rate for whites - and the number of homicides known to be caused by gang violence has quadrupled since 1980.