North Dakota officials say they're offering assistance to Dakota Access pipeline protesters as bitterly cold weather hits the protest camp.
"Weather in this particular region and in these conditions can be deadly quick," said Morton County Commission Chair Cody Schulz. "So we're concerned but we're hoping they use good judgment and if they need help we're here to help."
The county has formally offered assistance to the Standing Rock Sioux tribe, Schulz said, and the National Guard is on standby with six buses to evacuate people to shelters if needed.
So far, protesters camped near Cannon Ball, N.D., have resisted offers of help.
Some protesters have left the camp for shelters provided by the Standing Rock tribe.