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Image courtesy of Derrick Rossignol/Wikimedia Commons.

A group of Hollywood actors joined demonstrators in Washington D.C. on Wednesday who were protesting the Dakota Access Pipeline.

According to Reuters, Susan Sarandon, Riley Keough and Shailene Woodle were protesting outside the U.S. District Court for the District of Columbia during a hearing related to the $3.7 billion project.

Sarandon told Reuters she joined the protesters to bring attention to “this horrible thing that is happening to their land.”

The hearing was held by District Court Judge James Boasberg for a preliminary injunction that the Standing Rock Sioux Tribe is seeking to halt construction.

The injunction is part of a lawsuit the tribe filed against the U.S. Army Corps of Engineers in July, according to PBS Newshour.

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

Judge Boasberg expects to announce his decision by September 9.

The U.S. Army Corps of Engineers declined to comment on the matter.

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

The pipeline will be able to transport about 450,000 barrels per day with a capacity as high as 570,000 barrels per day or more, accounting for about half of Bakken current daily crude oil production.

The project is being developed by Dakota Access, LLC, a subsidiary of Energy Transfer Crude Oil Company.

A Dakota Access spokesperson told Reuters earlier this week that grading activities along a small stretch of the line’s right-of-way have been “temporarily deferred” while “law enforcement works to contain the unlawful protests.”

The project has garnered attention from Hollywood players before Wednesday’s hearing.

Earlier this year, Leonardo DiCaprio shared images on Instagram and Twitter voicing support the Standing Rock Sioux Tribe’s efforts to oppose the Dakota Access Pipeline.

Jason Momoa, who will star as Aquaman in the upcoming “Justice League” film, also took to social media to protest the project’s route.