Looks like the Walmart is a good mile away and contrary to popular belief, most rioting is usually contained to a few blocks.
While some/most of the locals were on foot rioting, there were plenty of 'outsiders' that arrived in vehicles. They weren't protesting, or rioting. They were just looting. They even spread it out over a larger area, just to overwhelm the police. IIRC, they even made fake 911 calls to divert the police.