A man stands on a makeshift bridge over the Cannonball River while police officers stand on the opposite shore. Stephanie Keith/Reuters hide caption

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Stephanie Keith/Reuters

Protesters, Police Still Clashing Over Disputed North Dakota Pipeline

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In this image made from video, a police officer uses pepper spray as he walks down a line of Occupy demonstrators sitting on the ground at the University of California, Davis on Friday, Nov. 18, 2011. Thomas K. Fowler/AP hide caption

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Thomas K. Fowler/AP