Concerns are raised in ongoing missing person investigation due to new video.

Nancy Guthrie, 84, is now the subject of a criminal investigation rather than a missing-person case. New footage shows dark stains on her Arizona home's porch, sparking increased efforts to unravel the mystery.

Authorities found signs of forced entry at the residence, with personal items like her phone and purse left behind. Sheriff Nanos revealed investigators believe Nancy was abducted from her home.

About 100 detectives are actively working on the case, examining surveillance videos, talking to neighbors, and pursuing tips from the public. While specifics are scant, the situation has raised significant concerns.

Nancy, who lived alone, vanished after her family dropped her off at home on a Saturday night. When she didn't show up at church the next day, prompting a search, concerns heightened. Her medical devices stopped syncing around 2 a.m., assisting in establishing a timeline.

Daughter Savannah Guthrie from the "Today" show has put work on hold to support the family. She appreciates the public's prayers and support. Officials request anyone with information, no matter how insignificant it may seem, to contact local authorities immediately.

Efforts continue to find Nancy safely and provide closure to her family as the investigation progresses.