The U.S. Army Corps of Engineers on Sunday announced it will not grant an easement permitting construction of the Dakota Access Pipeline under North Dakota's Lake Oahe, the Missouri River reservoir which has led to months of protests organized by the Standing Rock Sioux tribe. "Although we have had continuing discussion and exchanges of new information with the Standing Rock Sioux and Dakota Access, it's clear that there's more work to do," said Army Assistant Secretary for Civil Works Jo-Ellen Darcy.