What we know about Nancy Guthrie's disappearance

Authorities said on Wednesday they do not have a suspect in the alleged abduction of NBC news anchor Savannah Guthrie's mother, as they sought to tamp down on misinformation circulating online about the missing 84-year-old.

It has been four days since Nancy Guthrie disappeared in the middle of night near Tuscon, Arizona. Authorities believe she was "taken from her home against her will".

Since then, rumors have spread on social media and other sites about possible suspects, motives, and evidence found at the house, which law enforcement now considers a crime scene.

Pima County Sheriff Chris Nanos has described an all-hands-on-deck effort to find Nancy Guthrie that has included dogs, drones, helicopters, and the FBI.

When asked on Tuesday whether his department was still looking for someone who was alive, Nanos replied: "We hope we are."

Here is everything we know about the search for Nancy Guthrie.

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

Alarm 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 through the night.

Homicide detectives also arrived at her residence, an unusual move according to Nanos, where law enforcement had encountered a scene he said was cause for "grave concern". But Nanos has not elaborated on what they found.

On Monday, Nanos paused the search operation and labelled the home a crime scene.

While there was no initial indication that Nancy Guthrie could have been targeted because of her name, the sheriff has said "we can't dismiss that".

The next day Nanos told reporters at a news conference: "We do believe that Nancy was taken from her home against her will. And that's where we're at."

When asked about reports that police were testing blood found in the home, he answered: "I'm not saying saying there's blood inside that house or outside that house."

He also said that evidence gathered at the house had been sent to a lab for analysis. So far, the lab results and other evidence have not led authorities to a possible suspect.

The sheriff could not say whether more than one person had been involved in the alleged abduction.

In a post later on the Pima County Sheriff's Facebook account, the department said it was "aware of reports circulating about possible ransom note(s)", without offering more specifics.

Nanos also said the sheriff's office had received a copy of a ransom note and was working with the FBI to authenticate it.

Authorities have urged the public to call the sheriff's office with any information or tips, incentivised by a $2,500 (£1,827) reward, and said they would look into any and all leads.

They have warned that Nancy Guthrie would be in dire health without her medication.

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

Savannah Guthrie - Nancy's daughter and talk show host on NBC's Today programme - will not host the 2026 Winter Olympics opening ceremony Friday, as the investigation continues.

On Instagram, she thanked everyone involved in the case and asked for prayers.

"Bring her home," she wrote.