The pipeline had been set to cross under the Missouri River and man-made Lake Oahe, which are drinking water sources for the Standing Rock Sioux Tribe.
"It's clear that there's more work to do," Jo-Ellen Darcy, the US Army's assistant secretary for civil works, said in a statement yesterday.
"The best way to complete that work responsibly and expeditiously is to explore alternate routes for the pipeline crossing.
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