New Delhi, March 13 -- More than a month after 'Today' host Savannah Guthrie's 84-year-old mother, Nancy Guthrie , was abducted from her Arizona home, the sheriff handling the case has revealed more details, and said he believes the kidnapper could strike again.

"Don't think for a minute that because it happened to the Guthrie family, you're safe. No, keep your wits about you," he continued. "From day one, we had some strong beliefs about what happened, and those beliefs haven't diminished," Pima County Sheriff Chris Nanos told "NBC Nightly News" on Thursday, 12 March.

Nancy Guthrie was last seen around 9:30 PM (local time) on Saturday, 31 January, after being dropped home by a family member. When she failed to attend church Sunday morn...