Authorities report an increase in tips after releasing ransom notes in the Nancy Guthrie kidnapping. Nancy Guthrie, mother of Savannah Guthrie, vanished from her Arizona home in early February. Investigators have received hundreds of leads and multiple DNA samples since the investigation began. The alleged ransom notes claimed Nancy Guthrie was safe but later stated she had perished. The Pima County Sheriff's Office is following up on all received tips.