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Max Matzaand Regan Morris,Tucson, Arizona
Watch: What's happened since Savannah Guthrie's mother disappeared?
Police are investigating a message which may be linked to the missing mother of US news presenter Savannah Guthrie, as her family continues to plea for proof that their mother is still alive.
The FBI and Pima County Sheriff's Department said on Friday that they "are aware of a new message regarding Nancy Guthrie". The statement added that they are "inspecting the information provided in the message for its accuracy".
It comes after the first deadline from an alleged ransom letter passed on Thursday evening.
The 84-year-old is believed to have been abducted from her home in Tucson, Arizona last weekend. Police are offering a reward of $50,000 (£36,000) for information that leads to an arrest.
"The FBI and Pima County Sheriff's Department are aware of a new message regarding Nancy Guthrie," police in a statement on social media on Friday afternoon.
"Investigators are actively inspecting the information provided in the message for its authenticity."
The statement did not say who received the note, or any details that it may have contained.
A presenter for a local affiliate of CBS News told the BBC that her channel received the "message". It is unclear if it was sent to other media outlets.
On Thursday, Camron Guthrie - the son of the missing woman - renewed the family's plea, and confirmed that the family had not had any direct contact with kidnappers.
"We have to know that you have our mum," Camron said in the family's latest video message. "We want to talk to you."
"We haven't heard anything directly," he said in the video, posted on Thursday just after 17:00 local time in Arizona (00:00 GMT).
"We need you to reach out, and we need a way to communicate with you so we can move forward."
There has been a large police and media presence outside the Guthrie home for days
At a briefing on Thursday, FBI Special Agent Heith Janke said his agency was reviewing an alleged ransom note. It gave a deadline for payment of 17:00 on Thursday, he said, without specifying which time zone, and had a second deadline for Monday.
No further information was shared about what was threatened if the deadline was not met. "We're not going to go into specifics," Janke said.
It was announced the same day that authorities had made an arrest over a fake ransom note.
Earlier in the week, Savannah Guthrie shared an emotional video message, along with her siblings.
The host of NBC News' Today programme addressed the potential abductor or abductors directly, saying: "We are ready to talk... We need to know without a doubt that she is alive and you have her... Please, reach out to us".
Pima County Sheriff Chris Nanos said on Thursday investigators were no closer to finding out who was responsible - but that they were working on the assumption she was still alive.
"Right now, we believe Nancy is still out there. We want her home," he said. "Everybody's still a suspect in our eyes."
Neighbours have erected signs for the Guthrie family
The case has garnered nationwide attention, with dozens of reporters and camera crews descending on the quiet Arizona suburb where Nancy lives.
Authorities have closed access to her street, nestled below the Santa Catalina mountains on roads lined with the state's iconic Saguaro cactus.
One man, when asked how he felt about security, shouted that he had already been interviewed four times today and wasn't doing any more. He then showed us a big stick, saying this is all the security he needs. He added he was not worried about kidnappers but he was worried about javelina, the hoofed mammals found in Tucson.
Authorities have urged the public to call the sheriff's office with any information, vowing to look into all leads, and discouraging the spread of misinformation.
