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Hundreds of people have gathered in North Dakota to join the Standing Rock Sioux Tribe's protest of the Dakota Access Pipeline. Protesters, who fear pollution of their water, were attacked by dogs and sprayed with irritants after facing off with construction workers.

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Private security guards confront Native American protesters and their supporters at the work site near Cannonball, North Dakota.Robyn Beck/AFP / Getty Images

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A man pours water over the eyes of a protester after he was pepper-sprayed by security guards.Robyn Beck/AFP / Getty Images

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Private security guards photograph protesters.Robyn Beck/AFP / Getty Images

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Native Americans march to a sacred burial ground that was disturbed by bulldozers building the pipeline.Robyn Beck/AFP / Getty Images

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Marlo Langdeau of the Lower Brule Sioux Tribe joins hundreds of Native Americans for the march.Robyn Beck/AFP / Getty Images

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Protesters gather at the blocked entrance to a construction site for the Dakota Access Pipeline.Robyn Beck/AFP / Getty Images

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Native American protesters wave a flag on a work site for the pipeline.Robyn Beck/AFP / Getty Images

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A Native American protester pauses on land being graded for the pipeline.Robyn Beck/AFP / Getty Images

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Photo shows the encampment where hundreds of people have joined the Standing Rock Sioux Tribe's protest.Robyn Beck/AFP / Getty Images

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