It did warn, however, that “those who remain will be considered unauthorized and may be subject to citation under federal, state, or local laws.”
The statement comes after authorities announced on Friday that they were “closing the portion of the Corps-managed federal property north of the Cannonball River to all public use and access effective December 5, 2016.”
The Corps of Engineers has described the move as “necessary to protect the general public from the dangerous confrontations between demonstrators and law enforcement officials which have occurred near this area.”
Supporters of indigenous tribes opposed to the 1,172 mile (1,186km) pipeline said they would not leave the camp, which is on federal land alongside North Dakota’s Highway 1806 and the Missouri River. The announcement the land would be closed to them was described as a “disgusting continuation of 500 years of colonization and systemic oppression,” a spokesperson for the Indigenous Environmental Network said.
READ MORE: ‘We stand strong’: Standing Rock water protectors defy Army Corps’ threat of camp eviction (VIDEO)
Activists believe the pipeline, which will connect North Dakota to Illinois, could lead to water contamination at the Standing Rock Indian Reservation due to its proximity to the area.
Protests began in January when the project was approved. In April a camp was set up near the construction site which has since swelled to an estimated presence of 7,000 activists.
READ MORE: Hundreds of protesters march through DC against DAPL (PHOTOS, VIDEOS)
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