India, Feb. 7 -- The search for 84-year-old Nancy Guthrie continued this week as authorities in Tucson, Arizona, said they are investigating all possible leads and have not publicly named any suspects in the case.

Nancy, the mother of Today show anchor Savannah Guthrie, was reported missing after disappearing from her home in late January.

Pima County Sheriff Chris Nanos said investigators are treating the case broadly, noting that "everybody's still a suspect" as detectives work to determine what happened.

He added that law enforcement is reviewing anyone who may have had contact with Nancy before her disappearance and confirmed that the Guthrie family has been "very cooperative" throughout the investigation, reported Fox News.

Nancy...