Demonstrators march in Washington, D.C., on Friday, calling on the Trump administration to meet with tribal leaders and opposing construction of the nearly complete Dakota Access Pipeline. Manuel Balce Ceneta/AP hide caption
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Standing Rock Sioux Tribe
A protest against the Dakota Access Pipeline on March 4 in New York City. Kena Betancur/AFP/Getty Images hide caption
Snow falls on the Oceti Sakowin camp on Wednesday as structures smolder. Angus Mordant for NPR hide caption
Military veterans protesting the pipeline stand opposite police guarding a bridge at the edge of the Standing Rock Sioux Reservation on Dec. 1, 2016. Scott Olson/Getty Images hide caption
Piles of debris remain at camp. Some of these items were donated by people who support the movement. Others were abandoned by protesters who left camp. Amy Sisk/Inside Energy hide caption
A sign is seen at an encampment set up near Cannon Ball, N.D., Wednesday, where opponents are protesting the construction of the Dakota Access pipeline. James MacPherson/AP hide caption
Dakota Access Pipeline Protesters Vow To Fight Through Fierce Winter
On Sunday, protesters gather at their camp as news breaks that the Army Corps of Engineers will not approve an easement for the Dakota Access Pipeline. Cassi Alexandra for NPR hide caption
Jacob Brooks makes adjustments to one of the camp's many "tarpees," a winterized teepee made of tarp with a built-in chimney, designed by Paul Cheokoten Wagner. There are roughly 60 tarpees around various camps now, and Wagner has fundraised enough for another 20 more. Celia Talbot Tobin for NPR hide caption
Damin Radford of New Zealand overlooks the Oceti Sakowin camp on Tuesday, where people have gathered to protest the Dakota Access pipeline near Cannon Ball, N.D. David Goldman/AP hide caption
A sculpture stands at an encampment where protesters of the Dakota Access oil pipeline have been gathered for months near Cannon Ball, N.D., on Saturday. James MacPherson/AP hide caption
Protesters — or water protectors, as they identify themselves — walk along Highway 1806, past a sprawling encampment at Standing Rock on Thursday. Thousands of people gathered to join the Standing Rock Sioux Tribe's protest of the Dakota Access Pipeline. Jessica Rinaldi/Boston Globe via Getty Images hide caption
People at the Oceti Sakowin Camp enjoy a meal inside a tent that serves as a dining hall. Oceti Sakowin is the largest of several camps housing demonstrators against the Dakota Access Pipeline. Courtesy of Brian Yazzie hide caption
A member of the Stutsman County SWAT team who declined to give his name nor to be identifiable by badge stands guard by an armored personnel carrier equipped with an LRAD, or long range acoustic device, while deployed to watch protesters demonstrating against the Dakota Access Pipeline. John L. Mone/AP hide caption
Law enforcement dressed in riot gear arrest protesters who are demonstrating against construction of the Dakota Access Pipeline near Cannon Ball, N.D. Police and National Guard moved in on an encampment of tents and teepees on Thursday. Amy Sisk/Prairie Public Broadcasting hide caption
Tensions Escalate As Police Clear Protesters Near Dakota Access Pipeline
Dave Archambault, chairman of the Standing Rock Sioux tribe, stands outside a federal courthouse in Washington, D.C., on Oct. 5. Jessica Gresko/AP hide caption
In Fight Over N.D. Pipeline, Tribe Leader Calls For Peace And Prayers
Native American protestors gather at a construction site for the Dakota Access pipeline to perform a daily prayer ceremony. Over 1,000 people, most Native American, have gathered at two prayer camps along the Cannonball River near its confluence with the Missouri in North Dakota to protest the Dakota Access pipeline. Andrew Cullen hide caption
Native Americans march to a sacred site on Sunday that they say was disturbed by bulldozers working on the Dakota Access Pipeline, near the encampment where hundreds of people have gathered to join the Standing Rock Sioux tribe's protest. Robyn Beck/AFP/Getty Images hide caption
Native Americans march on Sunday to a sacred site they say was disturbed by bulldozers working on the Dakota Access Pipeline, near an encampment where hundreds of people have gathered to join the Standing Rock Sioux Tribe's protest. Robyn Beck /AFP/Getty Images hide caption
Native Americans protest the Dakota Access oil pipeline near the Standing Rock Sioux reservation in southern North Dakota. James MacPherson/AP hide caption
A protestor is treated after being pepper sprayed by private security contractors on land being graded for the Dakota Access Pipeline near Cannon Ball, N.D., Sept. 3, 2016. ROBYN BECK/AFP/Getty Images hide caption