What we know about the abduction of Savannah Guthrie's mother

The mystery surrounding the disappearance of the 84-year-old mother of NBC News anchor Savannah Guthrie has deepened, as the family and investigators continue to search for clues in the case.

Nancy Guthrie disappeared in the middle of night from her home in Tucson, Arizona, last weekend and authorities believe she was taken against her will.

Police in Arizona have not yet identified a person of interest in the suspected abduction and continue to investigate a series of apparent ransom notes that may have been sent from the person or people behind the alleged crime.

The Guthrie family has made several public pleas for her safe return, and has asked for proof that their mother is still alive.

Here is what we know about the case.

Guthrie was last seen at her home in Catalina Foothills, an affluent neighbourhood roughly six miles (10km) north-east of Tucson, on Saturday evening, when family members dropped her off around 21:30 local time (04:30 GMT).

At 01:47 local time on Sunday, a doorbell camera to her home was disconnected and removed, but officials said she did not have a subscription, so no footage could be recovered.

At 02:12, software data detected movement on camera near the home, but there is no video available and the sheriff acknowledged an animal could have caused the motion.

At 02:28, the app on her pacemaker, an implanted cardiac device, disconnected from her phone.

Concern grew on Sunday morning when members of her church noticed she was missing andnotified her family.

After the family called 911, authorities began a search that soon included volunteers and federal officers from Border Patrol, which stretched into the next morning.

Police have said they found blood on Nancy Guthrie's porch and analyses confirmed it was hers.

Officials have warned that she may be in dire health without her medication.

She has been described as "not in good physical health", but has no reported cognitive issues, Pima County Sheriff Chris Nanos said.

In a video message, Savannah Guthrie and her siblings said: "Her health, her heart is fragile. She lives in constant pain.

"She is without any medicine. She needs it to survive. She needs it not to suffer."

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.

FBI Special Agent Heith Janke said his agency was reviewing a ransom note sent to several media outlets.

Details about an Apple watch and a floodlight at Nancy Guthrie's home were in the note.

Police said one ransom note sent to the media had two deadlines: one at 17:00 on Thursday, which has since passed, and another on Monday.

The FBI also said it had arrested a person for a fake ransom note on Thursday morning.

Then on Friday, authorities said they were investigating a new message related to the case. A statement from the FBI and the sheriff's office said they are "inspecting the information provided in the message for its accuracy".

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. The presenter did not detail what was in the message.

In her emotional plea, Savannah Guthrie said she and her family were aware of the ransom note as well. She addressed the potential abductor or abductors directly.

"We are ready to talk," she said, adding that, "we need to know without a doubt that she is alive and you have her... Please, reach out to us."

In a separate video on Thursday, her brother Camron said that the family still had not received any contact from "whoever is out there holding our mother", adding: "We want to hear from you".

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.

In the social media post on Wednesday the sheriff's office said "the sharing of unverified accusations or false information is irresponsible and does not assist the investigation".

On Friday, officials said they are offering a reward of $50,000 (£36,000) for information that leads to an arrest.

US President Donald Trump, who ordered federal authorities help in the investigation, has called the case a "very unusual situation".

He said on Friday that he believed authorities "have some clues" and they we "could have some answers" soon.

Guthrie, 54, is an American broadcast journalist who has served as the co-anchor of NBC News' TODAY since 2012. She is also the network's chief legal correspondent and a primary anchor for its election coverage. Previously, she was NBC News' White House correspondent.

Guthrie was born in Australia but when she was a toddler her family moved to Tucson, Arizona where she grew up for most of her childhood. She did not travel back to Australia until 2015, visiting with her mom Nancy and fulfilling her "lifelong dream to return", she told The Daily Telegraph.

"For my mum to come back and get to see where she used to live brings back a lot of happy memories with my dad," Guthrie told the Daily Telegraph.

Guthrie, who maintains a public stance of political neutrality, has interviewed presidents Barack Obama, Joe Biden, and Trump.

She has a law degree from Georgetown University and a bachelor's degree in journalism from the University of Arizona.

She has won an Edward R Murrow Award for ethical electronic journalism and multiple News Emmys, including for an interview with Trump a month before the 2020 election.

Savannah Guthrie, who hosts the Today show, has not been on air this week.

She had been due to co-host the Winter Olympics opening ceremony for NBC on Friday, but will no longer take part in coverage to focus on being with her family, NBC said.

"Our hearts are with her and the entire Guthrie family as the search continues for their mother," a spokesperson for the network said.