On November 20, 2016, instances of police brutality took place near the Standing Rock Sioux Reservation, where members of the Oceti Šakowiŋ tribe and allies were protesting the construction of the Dakota Access Pipeline. A lawsuit was filed against Morton County, Morton County's Sheriff, the city of Mandan North Dakota, Mandan's Police Chief, Stutsman County, and Stutsman County's Sheriff, alleging that an unjustified violent attack took place against peaceful protesters. The legal collective representing the Native Americans alleges that the use of "Specialty Impact Munitions, explosive blast grenades, other chemical agent devices, and water cannons and water hoses in freezing temperatures" is excessive force. Numerous protesters were injured, resulting in the hospitalization of over two dozen individuals. In January 2017, militarized officers used tear gas and rubber bullets against unarmed protestors. United Nations Special Rapporteur, Maini Kiai, told the United Nations that the detention of the protestors was inhumane because of over-crowding and no access to medical care.