A federal judge is set to deliver a key ruling on the four-state Dakota Access Pipeline that has drawn thousands of protesters to a construction site in North Dakota in recent weeks.
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U.S. District Judge James Boasberg says he'll rule by the end of Friday on the Standing Rock Sioux tribe's request to block the $3.8 billion project, which will carry oil from North Dakota to Illinois.
The tribe argues the project threatens water supplies and has already disrupted sacred sites. The developer, Dallas-based Energy Transfer Partners, says modern technology allows quick detection of leaks. Pipeline supporters also say it would cut the amount of oil that travels by train.
A weekend confrontation between protesters and private security guards left some guards injured and some protesters with dog bites.