SHERIDAN — Firefighters contained a human-caused, half-acre fire in the Bighorn National Forest Wednesday afternoon.

Two volunteers at the Big Goose Ranger Station called in the Rapid Creek fire at approximately 2:30 p.m.

Firefighters with the U.S. Forest Service and a county outfit utilized a single-engine air tanker and a state helicopter to drop fire retardant. Two engines also responded to keep the blaze from spreading through the timber.

Six USFS firefighters remain on the scene Thursday.

“With the hot weather today, they’re going to stay up there,” Public Affairs Specialist Susie Douglas said. “They’ll stay up there as long as they need to.”

The source of the fire remains under investigation, but the USFS has ruled out lightning or any other natural cause.

Douglas said no properties or structures were damaged.