From Yahoo News:
A man was gravely wounded in a gun battle with police in Ferguson, Missouri on Sunday night after a day of peaceful rallies to mark the fatal shooting of an unarmed black teenager by a white officer one year ago. Several volleys of gunshots rang out as police in riot gear tried to disperse demonstrators blocking traffic and smashing storefront windows along a street that was a flashpoint of last year's unrest in the St. Louis suburb after Michael Brown, 18, was slain. Police later said the gunfire began with two groups of agitators apparently shooting at each other.
http://news.yahoo.com/ferguson-protests-mostly-peaceful-anniversary-brown-shooting-015555407.html
...
Anniversary commemorations had begun hours earlier with a peaceful march through the St. Louis suburb. The scene changed dramatically after dark. Dozens of protesters converged on West Florissant Avenue, which bore the brunt of last summer's rioting, and chanted: "Shut it down" in the midst of a severe thunderstorm.
(Score: 1) by khallow on Tuesday August 11 2015, @07:50PM
Most of the businesses that were destroyed were owned by people from outside the community
So what? That doesn't give anyone a blank check to destroy those businesses and incidentally harm their community.
Once the violence has subsided, the rage behind the riots may persist until the next elections
Which I think is the point here of the protests in the first place. FWIW, this is in part how democracy works. Problems simmer for decades until someone in power needs that little extra to win an election.