The Lewis and Clark County Sheriff’s Office said Saturday it was searching for a missing woman who had been riding a horse in the McMaster Hills Recreation Area.

Search and Rescue units from Lewis and Clark and Jefferson counties are on the ground, officials said.

Drones from various law enforcement agencies are searching by air. A helicopter from Great Falls has also been called in to assist, officials said on a Facebook post.

The sheriff’s office said it will be in the recreation area throughout the majority of the day.

Those who have information or would like to offer assistance, should call 406-219-7380.

No further information was immediately available.