TUCSON, Ariz. — The FBI is still examining some ransom messages tied to Nancy Guthrie, the 84-year-old mother of NBC's Savannah Guthrie, who was reported missing from her home in the Catalina Foothills on Feb. 1 and has not been found.

Two early notes have been traced to one source. Others have been thrown out as fraud. At least some remain open. In July the FBI's Phoenix office said some notes "have been deemed to be extortion attempts without legitimacy," and that other notes might be genuine and were still under investigation. The office said questions about the notes should go to the FBI. That statement pushed back on a Reuters report, citing an unnamed official, that investigators had judged all three kidnapping-related messages fake.

The first note reached a Tucson television station on Feb. 2, a day after Guthrie was reported missing when she did not appear for church. "Hello Savannah," it began. "We have your mother Nancy. She is safe but scared. She will be held for ransom and........

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