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STORY: FBI personnel were seen sweeping the home of the elderly mother of U.S. television journalist Savannah Guthrie on Friday (February 6), as the search for her enters its sixth day.

Personnel were seen on the roof and unmarked vehicles were parked in the driveway of 84-year-old Nancy Guthrie's home in Tucson, Arizona.

Investigators are examining a newly surfaced message in the presumed kidnapping, the FBI and Pima County Sheriff's Department said on Friday.

Authorities did not specify the nature or content of the latest communication, or where it was received, but the FBI and sheriff's department said in a joint statement that investigators were "actively inspecting the information provided in the message for its authenticity."

News of the message came three days after a purported ransom note was sent to media outlets and a day after 84-year-old Nancy Guthrie's relatives renewed their appeal to whoever may be holding her captive to contact the family directly "so we can move forward."

The first of two deadlines set in Tuesday's ransom letter, as described by law enforcement officials, came and went early on Thursday evening (February 5). A second deadline was set for next Monday (February 9).

The apparent home-invasion kidnapping of a vulnerable elder whose daughter is a well-known television news personality - the two have appeared together on the "Today" show - has drawn intense U.S. media attention.

U.S. President Donald Trump has spoken publicly about the case more than once this week. Talking to reporters on Air Force One on Friday, Trump suggested a resolution to the case was at hand, saying, "I think we could have some answers coming up fairly soon."