Article continues below advertisementThe man leading the investigation into Nancy Guthrie's disappearance reiterated last week that he believes the 84-year-old is the victim of a "targeted kidnapping."However, Arizona Sheriff Chris Nanos also admitted that the suspect could strike again, telling NBC News' Liz Kreutz on Thursday, March 12, that "it would be silly to tell people, 'Yeah, don't worry about it, you're not his target.