The disappearance of Nancy Guthrie, mother of "Today" show host Savannah Guthrie, three weeks ago has prompted volunteers to launch their own searches in the dense desert near her home, hoping to uncover clues.
Ms Guthrie, 84, was last seen at her residence just outside Tucson on 31 January and was reported missing the following day. Authorities believe she was kidnapped, abducted, or otherwise taken against her will, with drops of her blood found on the front porch. However, little other evidence has been publicly disclosed.
