Today's conflict comes after police arrested more than 120 demonstrators last weekend, bringing the total number of protest-related arrests since mid-August to 386 people, according to the Morton County Sheriff's Department.

\"PHOTO:
Sam Shawcross/Twitter
PHOTO: Tensions heightened between law enforcement and protesters over the Dakota Access Pipeline near the Standing Rock Sioux Tribe's reservation in North Dakota on Oct. 27, 2016.
>

Protesters said heavily armed law enforcement officers unleashed pepper spray on a crowd of unarmed demonstrators on Saturday, while officials say the protesters were illegally trespassing and the pepper spray was deployed as a preventative measure. Demonstrators justified their presence by citing an 1851 Treaty that they say specifies that the land was designated for Native American Tribes. The Morton County Sheriff's Department released a statement today saying \"authorities began taking steps to remove the illegal roadblocks and protesters trespassing on private property near Highway 1806.\"

Wyn Hornbuckle, the deputy director of public affairs for the U.S. Department of Justice, told ABC News in a statement that the department was \"taking the situation in North Dakota seriously.\"

Hornbuckle added that department employees have \"been in communications with state and local law enforcement officials, as well as tribal representatives and protesters, to facilitate communication, defuse tensions, support peaceful protests, and maintain public safety. The department has also offered technical assistance and community policing resources to local law enforcement in support of these goals.\"

Morton County Chairman Cody Schulz defended the Sheriff’s Department, saying, “The claim that law enforcement is escalating this situation is simply untrue. The law enforcement personnel from across the state, and now across the country have shown incredible professionalism and unbelievable restraint in the face of more and more aggressive tactics and illegal activity from the protesters. As we have stated from the very beginning, we fully respect the 1st Amendment rights of all protesters. The protester’s rights are just as important as those of the citizens of Morton County. But they are not more important.”

\"PHOTO:
Sam Shawcross/Twitter
PHOTO: Tensions heightened between law enforcement and protesters over the Dakota Access Pipeline near the Standing Rock Sioux Tribe's reservation in North Dakota on Oct. 27, 2016.
>

Danny Grassrope, 24, told ABC News Saturday that he was arrested at the protest site and witnessed police officers spraying protesters while they were praying.

\"This weekend we went to go demonstrate with peaceful action. We went to go pray,\" Grassrope said. \"Then while we were praying, the cops came and told us we couldn't be there. We were just standing there and then this police officer came and opened up with some pepper spray. We weren't antagonizing them or anything, we were just praying.\"

Grassrope said he was arrested and charged with criminal trespassing and engaging in a riot, and was held for six hours before a group of friends paid his bail. Grassrope has not yet entered a plea.

\"I don't understand why it was a riot, the police were in riot gear we were just praying,\" Grassrope added.

Grassrope said he has been living on the Standing Rock Sioux Tribe reservation for the past five years. His mother is Standing Rock Sioux and his father is Lower Brule Sioux.

\"We're not going to be silent anymore,” Grassrope said. “We are not going to be pushed in a box anymore, our people have been oppressed enough.”

\"PHOTO:
Tom Stromme/The Bismarck Tribune via AP
PHOTO: People protesting the Dakota Access Pipeline gather along North Dakota Highway 1806 in Morton County at the site of a new camp that was being put together, Oct. 24, 2016, in Cannonball, North Dakota.
>

Hushka, the public information officer for the Morton County Sheriff's Office, confirmed to ABC News that protesters including Grassrope had been arrested and charged with engaging in a riot and criminal trespassing, both class B misdemeanors. Hushka said there were about 300 protesters who trespassed onto private property, but the sheriff’s office was not disclosing the number of law enforcement that were at the scene.

\"Protesters attempted to breach the police line and did not follow the officers’ instructions,\" Hushka said. \"Officers did utilize pepper spray, to protect police officers.\"

\"There are no issues if they want to protest peacefully and legally, but on numerous occasions they have engaged in illegal action by trespassing on private property,” Hushka added.

\"PHOTO:
James MacPherson/AP Photo
PHOTO: Civil rights activist Jesse Jackson sits atop a horse, Oct. 26, 2016, while visiting the protest camp against the Dakota Access oil pipeline outside Cannon Ball, North Dakota.
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