India, Feb. 4 -- In a major update amid the ongoing search for Nancy Guthrie, Pima County Sheriff Chris Nanos stated that he believes that 84-year-old mother of the Today Show host, Savannah, is still alive.

"We have nothing else to go on but the belief that she is here. She's here. She's alive, and we are determined to rescue her," Nanos said in an interview with NBC that was broadcast on Wednesday morning.

He emphasized that his department is treating all tips and leads with utmost seriousness.

"The leads we've got coming in are critical to us. They're valuable, and we're sharing those with the FBI and others," the Sheriff remarked.

Nancy was allegedly abducted from her $1 million residence in Tucson, Arizona, either late Saturday o...