The Standing Rock Sioux say the pipeline threatens the tribe's water supply and cultural sites. The human rights organization Amnesty International praised the Corps' decision, saying "indigenous voices must not be ignored." The president of the National Congress of American Indians says an Army Corps of Engineers decision to deny a permit for the Dakota Access oil pipeline in North Dakota is a victory for "all of Indian Country." Oil pipeline protesters are pledging to remain camped on federal land in North Dakota, despite a favorable government ruling and an imminent deadline to leave.