A supportive sign left by neighbors posted outside of the home of Nancy Guthrie. ebecca Noble/ReutersA supportive sign left by neighbors posted outside of the home of Nancy Guthrie. ebecca Noble/ReutersArizona officials confirm blood found at Nancy Guthrie’s home was hersPima county sheriff says police do not yet have a suspect in apparent kidnapping of Savannah Guthrie’s motherLaw enforcement chiefs in Arizona on Thursday confirmed that they found blood belonging to Nancy Guthrie, the mother of the TV anchor Savannah Guthrie, on the 84-year-old’s porch after she was reported missing from home at the weekend. The sheriff of Pima county, Chris Nanos, said during a press conference authorities do not yet have a suspect in the apparent kidnapping. But they believe Nancy Guthrie is “still out there” and their protocol in such a situation is to assume she is alive until there is any information otherwise “and we’re going to continue thinking that way until we find her”, Nanos said. The FBI has become involved and the special agent in charge of the investigation, Heith Janke, announced a $50,000 reward for vital information and also said that a ransom note that is being investigated gave an initial deadline of 5pm local time on Thursday for a response. Nanos confirmed that blood found near the front door of Nancy Guthrie’s house, just north of Tucson, has tested positive for her DNA.