BISMARCK, N.D. — More federal firefighters have arrived on the scene of a large wildfire in the Little Missouri National Grassland of western North Dakota.

A U.S. Forest Service team from Idaho is now on site to augment existing crews. Nearly 100 people are battling the Magpie Fire.

Forest Service spokeswoman Treva Slaughter says the fire grew slightly to about 8 ½ square miles (22 square kilometers) and remained 15 percent contained Monday night.

The fire that started Saturday is in a remote area and not threatening any structures, people or livestock. It did prompt the shutdown of a 40-mile (64-kilometer) stretch of the 144-mile (231-kilometer) Maah Daah Hey Trail system.

The cause of the blaze is still being investigated.

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