CANNON BALL, N.D. (AP) — The Secretary of the Interior says the U.S. Army Corps of Engineers' decision to not grant an easement for the Dakota Access oil pipeline "ensures there will be an in-depth evaluation of alternative routes."

Sally Jewell also said in a statement that the decision "underscores that tribal rights ... are essential components of the analysis" for the environmental impact statement.

The Corps said Sunday afternoon that the pipeline cannot be built under Lake Oahe, a Missouri River reservoir where construction had been on hold.

The route has been the subject of months of protests by the Standing Rock Sioux tribe and others, who have argued the pipeline threatens a water source and cultural sites.

The company constructing the pipeline, Dallas-based Energy Transfer Partners, and the Morton County Sheriff's Office didn't have immediate comment.