India, Feb. 2 -- WhatPima County, Arizona, Sheriff Chris Nanos provided an update on the search for Nancy Guthrie, the 84-year-old mother of TODAY! show host, Savannah Guthrie, who has been missing since Saturday.

Nanos confirmed that the Pima County home where Nancy Guthrie lived is now a crime scene and investigators are suspecting possible foul play in the missing case. Sheriff Nanos said that Nancy Guthrie did not walk out of the house on her own, adding that she is "of sound mind" and "as sharp as a tack."

"We believe we do in fact have a crime scene," Sheriff Nanos said in the presser on Monday afternoon. He explained that the reason why investigators believed the house is a crime scene is because of Nancy Guthrie's limited abilit...