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Over two dozen protesters were arrested across two states on Wednesday during demonstrations against the Dakota Access Pipeline.

According to the Des Moines Register, about 30 people were arrested in Boone County, Iowa on a trespassing charge while trying to block construction on the $3.7 billion project.

A representative for Precision Pipeline, a contractor working on the project, reportedly told the protesters to leave the site after they attempted to block four entrances, the paper said.

The protesters were taken to the Boone County Jail.

Eight protesters were also arrested at a separate demonstration in South Dakota on Wednesday.

According to the Bismark Tribune, Dale “Happy” American Horse Jr. was arrested after spending more than six hours with arms around a lock box at one of the pipeline’s construction sites in South Dakota.

Local police officers eventually had to saw a pipe away from the protester’s hands to remove him from the site.

Several other protesters were also arrested at the scene for attempting to block the use of construction equipment, the Bismark Tribune said.

Native American and environmentalist groups have been protesting the Dakota Access Pipeline citing concerns about water quality.

In August, District Court Judge James Boasberg held a hearing for a preliminary injunction the Standing Rock Sioux Tribe is seeking to stop construction on the line.

The injunction is part of a lawsuit the tribe filed against the U.S. Army Corps of Engineers earlier this year.

The tribe has claimed that the U.S. Army Corps of Engineers violated historic preservation and environmental laws when it approved the pipeline, according to Reuters.

Judge Boasberg expects to announce his decision by September 9.

The Dakota Access Project will stretch 1,172 miles and will connect Bakken and Three Forks production areas in North Dakota to Patoka, Illinois.

According to the Des Moines Register, lawyers for Dakota Access told the Iowa Utilities Board last week that nearly a quarter of the pipeline’s section in Iowa had been welded and lowered into the ground.

The lawyers added that 93 percent of the pipeline’s South Dakota section has been built and 63 percent of its North Dakota section has been completed.