BISMARCK, N.D. (AP) — Some of the remaining protesters at the Dakota Access oil pipeline camp have set fire to a building that was serving as the main entrance to the area.

North Dakota Indian Affairs Director Scott Davis says protesters also have strung barbwire across the opening to the encampment.

The U.S. Army Corps of Engineers set a 2 p.m. deadline Wednesday for protesters to leave the camp that’s on federal land near the Standing Rock Indian Reservation. At least 150 people marched out of camp ahead of the deadline, but others have said they don’t plan to leave on their own.

Nathan Phillips, a member of the Omaha Tribe in Nebraska, said he planned to move to another camp that’s on private land. He says he has been in North Dakota since Thanksgiving and has “had four showers since.”