NBC News – (NBC News) Tensions are high in North Dakota, where the largest Native American protest ever is taking place at the site construction site of a controversial oil pipeline.
Thursday afternoon's clash between protesters and police spilled into the early morning hours.
More than a 140 have been arrested, but demonstrators promise their fight is not over.
An army of 200 officers cleared demonstrators blocking a highway used to access the Dakota Access Pipeline construction site.
The nearly completed pipeline will cross four states, connecting North Dakota and Illinois with 1,200 miles of pipe.
The $3.8-billion dollar project will be capable of transporting 570,000 barrels of oil a day.
The construction runs along the Standing Rock Sioux Reservation. Demonstrators say it's destroying sacred land and also threatens to pollute the Missouri River, which provides water to millions of people.