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The Missouri River is seen beyond an encampment September 4, 2016 near Cannon Ball, North Dakota where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest of the Dakota Access Pipeline (DAPL) that is slated to transport approximately 470,000 barrels of oil per day from the Bakken Oil Field in North Dakota to refineries in Illinois. Protestors were attacked by dogs and sprayed with an eye and respiratory irritant yesterday when they arrived at the site to protest after learning of the bulldozing work. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

The Missouri River is seen beyond an encampment September 4, 2016 near Cannon Ball, North Dakota where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest of the Dakota Access Pipeline (DAPL) that is slated to transport approximately 470,000 barrels of oil per day from the Bakken Oil Field in North Dakota to refineries in Illinois. 
Protestors were attacked by dogs and sprayed with an eye and respiratory irritant yesterday when they arrived at the site to protest after learning of the bulldozing work. / AFP / Robyn BECK        (Photo credit should read ROBYN BECK/AFP/Getty Images)