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FERGUSON, MO - AUGUST 10:  Demonstrators, marking the one-year anniversary of the shooting of Michael Brown, confront police during a protest along West Florrisant Street on August 10, 2015 in Ferguson, Missouri. Mare than 100 people were arrested today during protests in Ferguson and the St. Louis area. Brown was shot and killed by a Ferguson police officer on August 9, 2014. His death sparked months of sometimes violent protests in Ferguson and drew nationwide focus on police treatment of black offenders.  (Photo by Scott Olson/Getty Images)
FERGUSON, MO - AUGUST 10:  Demonstrators, marking the one-year anniversary of the shooting of Michael Brown, confront police during a protest along West Florrisant Street on August 10, 2015 in Ferguson, Missouri. Mare than 100 people were arrested today during protests in Ferguson and the St. Louis area. Brown was shot and killed by a Ferguson police officer on August 9, 2014. His death sparked months of sometimes violent protests in Ferguson and drew nationwide focus on police treatment of black offenders.  (Photo by Scott Olson/Getty Images)

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    Police: Protesters in Ferguson threw rocks and bottles

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Police: Protesters in Ferguson threw rocks and bottles

The St. Louis County police said frozen water bottles were thrown at officers in Ferguson, prompting them to order the crowd to disperse or face arrest. CNN's Ryan Young reports.

Police: Protesters in Ferguson threw rocks and bottles

The St. Louis County police said frozen water bottles were thrown at officers in Ferguson, prompting them to order the crowd to disperse or face arrest. CNN's Ryan Young reports.