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TOPSHOT - A Native American protestors holds up his arms as he and other protestors are threatened by private security guards and guard dogs, at a work site for the Dakota Access Pipeline (DAPL) oil pipeline, near Cannon Ball, North Dakota, September 3, 2016. Hundreds of Native American protestors and their supporters, who fear the Dakota Access Pipeline will polluted their water, forced construction workers and security forces to retreat and work to stop. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

TOPSHOT - A Native American protestors holds up his arms as he and other protestors are threatened by private security guards and guard dogs, at a work site  for the Dakota Access Pipeline (DAPL) oil pipeline, near Cannon Ball, North Dakota, September 3, 2016.
 

Hundreds of Native American protestors and their supporters, who fear the Dakota Access Pipeline will polluted their water, forced construction workers and security forces to retreat and work to stop. / AFP / Robyn BECK        (Photo credit should read ROBYN BECK/AFP/Getty Images)