Dozens of people participated in ceremonies and left on foot from the Oceti Sakowin camp under threat of deadlines by the U.S. Army Corps of Engineers and the state of North Dakota. Others stayed to risk arrest by authorities clearing the land to continue construction of the Dakota Access Pipeline under Lake Oahe. The state provided travel assistance and other services for those voluntarily leaving the main camp for people opposing the pipeline. Buses came to take people to an assistance center in Bismarck.