BISMARCK, N.D. — Containment of a large wildfire burning in the Little Missouri National Grassland of western North Dakota has reached 70 percent.

The U.S. Forest Service says firefighters were aided by cooler temperatures and advanced containment by 10 percent from Thursday to early Friday.

The fire started Saturday in a remote area and isn’t threatening any structures, people or livestock. The cause isn’t known. Officials say the fire in some areas could continue to smolder for weeks.

About one-third of the Maah Daah Hey hiking, biking and horseback riding trail remains closed, along with two campgrounds.

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