An official with the Morton County Sheriff's Department told the Associated Press 141 people were arrested Thursday.
Police officers used pepper spray to break up a camp of protesters. Among those arrested was one person who had fired three shots at police. No serious injuries were reported. One man was treated for a leg injury, according to the AP.
Sheriff Kyle Kirchmeier said protesters were given a final warning Wednesday to leave the private land, but they did not go.
Protests by Native Americans and their supporters have been held in the area since July. The demonstrators oppose the building of the Dakota Access pipeline.
Much of the 1,700-kilometer pipeline is nearly complete. When finished, it would transport about 400,000 barrels of oil a day from North Dakota to Illinois. From Illinois, other pipelines could then transport the supply to shipping ports and refineries across the United States.
The pipeline's path comes within one kilometer of land belonging to American Indians from the Standing Rock Sioux tribe.
The tribe has said the pipeline, which would be buried under the nearby Missouri River, could endanger its water supply. It also believes construction could destroy sacred Native American historical sites.
The movement supporting the tribe's position has expanded to include environmental groups. Supporters include Green Party presidential candidate Jill Stein, civil-rights activist Jesse Jackson, Hollywood celebrities and U.S. Congress members.
支持该部落立场的运动已经扩大到环境组织。支持者包括绿党总统候选人Jill Stein、民权活动家Jesse Jackson、好莱坞明星和美国国会议员。
Hundreds of protesters had gathered on nearby U.S. government-owned land to hold demonstrations. Others have been arrested since those protests began in July.
But this week, the protesters occupied land owned by Energy Transfer Partners, which leads construction of the pipeline. The company has rejected the protesters' arguments and says the project meets all legal requirements.
但是这周，抗议者占据了主导这条石油管道建设的Energy Transfer Partners公司所拥有的土地。该公司否认了抗议者的说法，称该项目符合所有法律要求。
Supporters of the project say the pipeline is a safer and more cost-effective method than using roads or railways to move the oil.
The tribe brought a legal case in court to dispute the approval of permits by the U.S. Army Corps of Engineers for construction on federal land. A federal judge denied a request in September to halt the project.
But three federal agencies took action to stop construction on land owned by the Army Corps of Engineers. The Corps is currently deciding whether to reconsider the environmental impact of the pipeline. This would stop construction for a longer period.
A spokesman for the protesters said the latest police action will not silence the movement. He said they plan to build a new camp at another location in the pipeline's path - but this time on federal land.
I'm Bryan Lynn.