Pleas by Savannah Guthrie's family to find their missing mom turn from hopeful to desperate

Authorities have released few details, leaving it unclear if ransom notes demanding money with deadlines already passed were authentic and whether the Guthrie family has had any contact with the abductors.

Guthrie and her family have posted a series of videos over the past week, each striking a different tone. The latest message from Savannah Guthrie, in which she appeared alone, was more bleak.

“We are at an hour of desperation,” she said Monday, telling the public: “We need your help.”

Authorities believe Nancy Guthrie was taken against her will from her house just outside Tucson. She was last seen there Jan. 31 and reported missing the next day after not attending church. DNA tests showed blood on Nancy Guthrie’s front porch was a match to her, and a doorbell camera was disconnected in the early hours of Sunday morning, Pima County Sheriff Chris Nanos has said.

Adding to the urgency is that authorities say Nancy Guthrie needs daily medication because she is said to have high blood pressure and heart issues, including a pacemaker.

Investigators were in her neighborhood several times over the past few days and plan to keep working Tuesday as they expand the search and follow up on new leads, the sheriff’s department said.

Three days after the search began, Savannah Guthrie and her two siblings sent their first public appeal to the kidnappers, telling them “we want to hear from you and we are ready to listen.”

In the recorded video, Guthrie said her family was aware of media reports about a ransom letter, but they first wanted proof their mother was alive. "Please reach out to us,” they said.

Law enforcement officials declined to say whether the letters sent to several media outlets were credible but said all tips were being investigated seriously.

The next day, Savannah Guthrie’s brother again told the kidnappers to reach out "so we can move forward.”

“Whoever is out there holding our mother, we want to hear from you. We haven’t heard anything directly,” Camron Guthrie said.

Then over the past weekend the family posted another video — one that was more cryptic and generated even more speculation about Nancy Guthrie's fate.

“We received your message, and we understand. We beg you now to return our mother to us so that we can celebrate with her,” said Savannah Guthrie, flanked by her siblings. “This is the only way we will have peace. This is very valuable to us, and we will pay.”

Up to that point, the family's first three videos addressed the kidnappers directly.

But just ahead of Monday's deadline spelled out in a purported note, Savannah Guthrie urged people nationwide to be on the lookout “no matter where you are, even if you’re far from Tucson, if you see anything, if you hear anything.”

Her turn to the public comes as much of the nation is closely following the dramatic twists and turns involving the longtime anchor of NBC’s morning show.

The FBI this week began posting digital billboards in major cities from Texas to California.

Connor Hagan, a spokesperson for the FBI, said Monday that the agency wasn’t aware of ongoing communication between Guthrie’s family and the suspected kidnappers. Authorities also had not identified any suspects or persons of interest, he said.

“Someone has that one piece of information that can help us bring Nancy home,” he said.

Seewer reported from Toledo, Ohio.