The respected black commentator and philosopher Thomas Sowell has described the growing toll of black-on-white violence as a race war. I would take issue with that only because "war" implies a level of organization that supersedes that of the flash mobs.
Most of the riot organizers have moved on to cozier job titles, like Al Sharpton, who has gone from organizing riots and boycotts to holding down a desk at MSNBC and serving as the unofficial White House liaison to the black community. The old riots were usually a combination of organized protest and opportunistic violence. The organized riot is on the decline, but the opportunistic violence is still very much with us.