As helicopters circled overhead, police in riot gear arrested activists Thursday in an effort to break up an encampment of protesters blocking the path of the planned Dakota Access oil pipeline, near the Standing Rock Sioux reservation. By the end of the day, authorities said they had ousted the protesters from their camp.

 Protesters confront soldiers and law enforcement officers assembled Thursday to force Dakota Access pipeline opponents off private land. (Mike McCleary / Bismarck Tribune)

Protesters confront soldiers and law enforcement officers assembled Thursday to force Dakota Access pipeline opponents off private land. (Mike McCleary / Bismarck Tribune)

Police arrested at least 141 people on charges including criminal trespassing, engaging in a riot and conspiracy to endanger by fire, according to the Morton County Sheriff's Department. 

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