Savannah Guthrie’s missing 84-year-old mother Nancy did not leave her $1 million home of her own volition, police fear – and now a source has told the Daily Mail why.

‘Her stuff was left behind at the house: keys, ID, purse, phone. Everything,’ an insider close to the star told the Daily Mail on Monday morning.

REVEALED: The disturbing secret evidence found home of Savannah Guthrie's missing mother, as cops and star fear she did not leave home of her own accord

‘It’s not a situation where she voluntarily went away, because she didn’t take any of the things you would normally take if you voluntarily went out.’

Savannah ‘doesn’t believe that her mom just went out of her own accord’ the source added – with Pima County Sheriff Chris Nanos backing up that theory at a press conference on Monday as he said: ‘We do in fact have a crime scene.’

Sheriff Chris Nanos added: ‘She is very limited in her mobility. She did not just walk out of there.

‘There are other things at the scene that indicate she did not leave on her own.’

Nancy was last seen at her home in Tucson, Arizona home around 9:45pm on Saturday night.

She does not have dementia or cognitive decline, the Daily Mail understands.

Nancy also left home without taking medication that she needs to survive, Pima County Sheriff’s Office and Today show host Jenna Bush Hager said on Monday.

Nancy’s neighbor Paul Arnaud said he’d heard Nancy vanished shortly after being dropped off from a church function by a friend on Saturday night.

He said the alarm was raised after she failed to turn up for Sunday service the next morning.

Savannah Guthrie Family: What to Know About Missing Mom Nancy, Siblings

Savannah Guthrie is said to be fearful that her missing mother Nancy did not leave her home of her own accord

Nancy disappeared from her $1 million home in Tucson on Saturday night

Pima County Sheriff Chris Nanos held a press conference on Monday morning as they continue to investigate Nancy’s disappearance

Arnaud added: ‘We heard that the front door was left open.

‘So a lot of us are worried that it was an abduction because they did a thorough search throughout the entire day and early evening of the entire area and they could not find her.’

Another source said: ‘I don’t think they can say [what happened] yet, but it sounds like it was bad.

‘It’s not like she was mentally unwell and wandered out, if you know what I mean.’

The Daily Mail understands that Nancy was not suffering from dementia or any form of cognitive decline.

REVEALED: The disturbing secret evidence found at home of Savannah Guthrie's missing mother, as cops and star fear she did not leave home of her own accord | Daily Mail Online

NBC News staff held a prayer circle on Monday to pray for Nancy’s safe return home. Jenna Bush Hager was on the verge of tears on-air, as she said that Nancy does not have medication that she needs to survive.

Homicide detectives from Pima County Sheriff’s Office are investigating Nancy’s disappearance.

The FBI are also said to be ‘aware’ of the case.

Pima County Sheriff Chris Nanos said the hunt for Nancy was still being treated as a search and rescue operation but said he could not rule out foul play.

Customs and Border Patrol have joined the search because of Nancy’s relative proximity to the Mexican border.

Savannah Guthrie is pictured with her mother Nancy

Craig Melvin looked somber as he discussed news of Nancy Guthrie’s disappearance on Today Monday

Jenna Bush Hager, left, was on the verge of tears on Monday morning as she said that Nancy does not have medication that she needs to survive

Savannah is pictured with her mother Nancy, brother Camron and sister Annie

Drones and a plane have been deployed in a bid to find her.

Special Report: Disappearance of Savannah Guthrie's mother being investigated as a crime scene

Savannah was not at work on Monday but issued a statement, saying: ‘I want to thank everyone for the thoughts, prayers, and messages of support. Right now, our focus remains on the safe return of our dear mom.

‘We thank law enforcement for their hard work on this case and encourage anyone, anyone with information to contact the Pima County Sheriff’s office at 520-351-4900.’

She had only recently returned to the famous NBC studio after undergoing surgery.

Savannah was close to her mother and recently brought her to visit the Today show studios at Rockefeller Plaza in New York City.

Nancy was widowed, with her husband Charles – Savannah’s father – dying of a heart attack in 1989 aged just 49.

Nancy has two other children who are Savannah’s older siblings – a daughter named Annie and a son named Camron.