The increasingly violent attacks by North Dakota police and private security forces against peaceful, Indigenous water protectors have caught the nation’s attention as well as that of the United Nations, an arm of which has begun an investigation into the protesters’ claims of human rights abuses, including “excessive force, unlawful arrests, and mistreatment in jail,” the Guardian reported late Monday.

Observers have begun collecting testimonies from those protesting the Dakota Access Pipeline and, on Monday, Grand Chief Edward John, a Native American member of the U.N. permanent forum on Indigenous issues, met with police officials in Mandan, North Dakota and visited the cages where some of the 141 arrested protesters were held after last week’s military-style police raid.

Those detained at the Morton County Correctional Center said that while they were held in the 10-by-14-foot cages they were forced to wait for basic necessities, such as “access to bathrooms, food, water, and medical attention,” the Guardian reported.

“We embarked upon a peaceful and prayerful campaign,” Standing Rock Sioux member Phyllis Young told the U.N. representatives. “They were placed in cages. They had numbers written on their arms very much like concentration camps.” Young said that the police’s treatment of native people was “not only conditions of colonialism, but conditions of war.”

“The government is allowing the police force to be used as a military force to protect an oil company,” added protester Kandi Mossett, a member of the Mandan, Hidatsa, and Arikara nation.

The Morton County Sheriff’s office has also been accused of tracking the activists through a feature on Facebook, a claim which spurred more than one million people worldwide to “check in” to the Standing Rock Sioux reservation on Monday in an attempt to “overwhelm and confuse” law enforcement and express solidarity with the demonstrators.

The fact that a campaign of “intimidation and repression” is being waged on behalf of a private company is not to be overlooked, according to a coalition of environmental groups, which late last week sent a letter (pdf) to the owners of the $3.7 billion tar sands pipeline, reminding them of their “complicity” in the ongoing human rights abuses.

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