BOZEMAN, Mont. (AP) — Officials in southwestern Montana say three houses were burned in a wildfire in Gallatin County.

County emergency officials say two "secondary residences" and seven outbuildings also were lost in the fire that started Monday afternoon near the community of Clarkston, which is along the Missouri River northeast of Three Forks.

The fire burned nearly 2 square miles (5 square kilometers) of land and was 33 percent contained Friday morning. Crews were working Friday to increase containment and put out hot spots.

About 160 people are assigned to the fire, which burned in grass and juniper among about 40 buildings.

The cause of the fire has not been determined.