Protesters mark a solemn Thanksgiving Day at Standing Rock

Protesters gather at Standing Rock Reservation on Thanksgiving Day to build a bridge to Turtle Island, which they consider sacred ground. Police are seen lining the island hill beyond them. (Photo by Cassi Alexandra for NPR)
Several thousand Native Americans and their supporters continued to camp out near the Standing Rock Sioux Reservation in North Dakota on Thanksgiving Day.
Citizens of the Standing Rock Sioux Nation set up the Sacred Stone Camp in April to protest the Dakota Access Pipeline,