This is police brutality against unarmed protestors.

Police used water cannons against protestors in the No-DAPL protest in North Dakota last night, in 20 degree weather. Tribal leaders have asked the police to cease this practice, for fear of hypothermia among those hit with the water cannons. HLN's Michaela Pereira talked with CNN's Paul Vercammen:

PEREIRA: We're going to turn to North Dakota where police are under fire for using water cannons on protesters at the Dakota access pipeline protest. Some 400 protesters clashing with police last night. Police using water cannons to try to control them. We should point out that temperatures there dipped into the 20s. It's cold. not as cold as it can get, but tribal leaders from the -- tribal healers from the Standing Rock Sioux Tribe called on police to stop using the water because they're concerned about hypothermia. Police say they used the water to put out fires that had been started by protesters and also to control the crowd. Paul Vercammen joins me. you have been working the phones trying to get some answers about the injuries. we should point out it's tough to get information out of the protest and out of that area.

VERCAMMEN: It's a very remote area and authorities aren't going to reveal all. We know they have confirmed to us they did use rubber bullets. They also used tear gas and those are makeshift water cannons. They took these rural fire engines and attached powerful hoses to them and started blasting away and that's why the tribal council was so upset. they are fearing that people could get, you know, deathly sick.

PEREIRA: Well, it's freezing there now. Look, North Dakota is no joke in the winter. We're not even at those temperatures in that area yet, but that is a real concern.