SHERIDAN, Wyo. (AP) — Bighorn National Forest officials are investigating an early-season wildfire in the Tongue River Canyon west of Sheridan.

They say the fire was human-caused.

A hiker reported the fire on a dry, south-facing slope Sunday afternoon. The fire burned about 30 acres of timber and grass but firefighters got the flames under control.

They're expecting rain in the area Monday and Tuesday.

Forest officials urge campers to be careful with campfires.