Police arrested protesters near the Dakota Access Pipeline construction in North Dakota.
There have been protests near the construction site for months, but lately it's gotten more heated.
The National Guard stepped in to back up local police.
Over 100 people were arrested at the end of October. That's the most arrests at one time during the camp outs.
And there's been violence, like police brutality. Guards used dogs to attack protesters.
And police repeatedly shot down a drone as it recorded footage.
Demonstrators are protesting and camping out on a main road — blocking it off.
"They were also advised that they can't be blocking state highways. They cannot be trespassing," a Morton County sheriff said.
The "water protectors" say they won't leave anytime soon.