Montana authorities released a statement Wednesday saying they're trying to confirm that the remains are those of 43-year-old Sherry Arnold, who disappeared Jan. 7 during a morning run.

Authorities say they started recovery efforts Tuesday and found the body Wednesday, and it had been buried. It's still not clear what led them to that location.

Two Colorado men, Lester Vann Waters Jr. and Michael Keith Spell, both from Parachute, Colo., have been arrested and charged with aggravated kidnapping in the case and face a possible death penalty if convicted.

Spell received court permission to leave Colorado just two days before the woman disappeared.

The Grand Junction Daily Sentinel reported that Spell got approval from a Garfield County judge on Jan. 5 to go to Texas, saying his brother had been in a car accident there.

Arnold disappeared two days later in Sidney, while out on her morning run.

Sidney is an oil boom town near the North Dakota border.