We're about to pause this page, but before that, let's catch you up on where things stand.

• Police are searching the house of a man held in connection with the disappearance of Nancy Guthrie, the mother of US television anchor Savannah Guthrie. They say the operation was expected to last "several hours"
• Earlier on Tuesday, the FBI released photos and video showing a masked person at Guthrie's doorstep the night she disappeared. This person was armed, officials say. It is unclear if this is the person detained
• Nancy Guthrie, 84, is believed to have been taken against her will from her home in Tuscon, Arizona on 1 February, prompting a widespread search
• Savannah Guthrie has released several appeals for help on Instagram. In one of them posted on Tuesday, she said her family believes their mother is still alive: "We believe our mum is still out there... We need your help."
• Officials say they are offering a reward of $50,000 (£36,000) for information that leads to an arrest

Thank you for following our coverage on the latest developments in this case. You can read more in our news story here

Law enforcement officials initially said they couldn't retrieve footage from Nancy Guthrie's doorbell camera because she didn't subscribe to a particular service.

She had a Google Nest doorbell – according to a clip now made public – which provides 30 days of video history with a subscription, but just three hours of footage without it.

The video, released by the FBI on Tuesday, shows a masked person tampering with the camera on the morning of her disappearance.

Authorities did not explicitly state how they eventually managed to get the video, but according to Google's privacy policy, footage from all its devices is sent back to the company. This means Google should be able to retrieve specific videos.

FBI director Kash Patel told Fox News this evening that by working with partners in the private sector, the FBI were able to lawfully "go into their systems and actually excavate material that people would think would normally be deleted and no-one would look for."

Image source, AFP via Getty Images

As we reported earlier, the FBI has released fresh images and videos of a masked person at Nancy Guthrie's doorstep the night she disappeared.

White House press secretary Karoline Leavitt told reporters that she and President Donald Trump have reviewed the surveillance footage.

Leavitt says Trump's initial reaction was one of "pure disgust".

"The president directed me to please encourage all Americans with any information to call the FBI," Leavitt tells reporters.

"Once again, I will reiterate that the prayers of this entire White House are with Savannah and her family at this time," Leavitt says.

Trump had previously described the case as "very unusual" and ordered federal authorities to help in the investigation.

Image source, Reuters

We can now show you some pictures from Rio Rico where police are searching the house of a man who is being held in connection with the disappearance of Nancy Guthrie.

Authorities have not released any details of the person being held.

Meanwhile a woman has been speaking to US media outlets including an affiliate of CBS, the BBC's US partner. She has identified herself as the mother-in-law of the detained person and said he has nothing to do with the case.

"They're just invading my property," she is quoted as saying by CBS.

"I told him (an investigator) they're going in and out of my house, taking a lot of pictures and everything.

"I told him, we're not hiding anything. I gave him permission. You can go and search and there's nothing in my house. You won't find anything because we don't have nothing to hide," she says.

Image source, Reuters

A few hours ago, the FBI released footage of a masked person at Nancy Gutrhrie's house on the morning she disappeared.

The agency said that the video had been "previously inaccessible" before its release.

In the video, the masked person can be seen checking the camera before moving away, picking up some vegetation from the ground and using it to cover the camera lens.

Police have detained a person in connection to the disappearance of Nancy Guthrie, the 84-year-old mother of US news anchor Savannah Guthrie.

If you're just joining us, here's a rundown of the latest developments:

• Police are searching the Arizona home of the person detained, according to sources who spoke to the BBC's US partner CBS. The person is believed to live in a house in Rio Rico, south of Tucson, and was taken into custody at a traffic stop
• This comes after the FBI released photos and video showing a masked person at her doorstep the night she disappeared. This person was armed, officials say. It is unclear if this was the person detained
• Guthrie, 84, is believed to have been taken against her will from her home in Arizona on 1 February, prompting a widespread search
• Savannah Guthrie and her siblings have released several appeals for help on Instagram. In one of them posted on Tuesday, she said her family believes their mother is still alive: "We believe our mum is still out there... We need your help."
• The FBI is offering a $50,000 (£36,000) reward for information in the case

Image source, Getty Images

The footage released by the FBI may have "spurred someone to come forward with critical information" that has led to the detention of a person of interest, former FBI agent Michael Harrington tells the BBC.

Harrington says the video, which shows a masked person at Nancy Guthrie's doorstep the day she disappeared, shows the person "didn't plan out very well how he was going to conceal a view of the camera".

"This could indicate that this individual was not very well-versed in this type of activity," he tells the BBC's Newsday programme.

However, Mary Ellen O’Toole, a former FBI profiler, says that the video shows someone who was able to quickly adapt because of prior experience.

“You can only get that calmness from two things: your personality and your experience being in situations like this before,” she tells CNN.

Image source, Getty Images

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 mum Nancy and fulfilling her "lifelong dream to return", she told the Daily Telegraph.

"Our priority is to find Nancy Guthrie" FBI Director Kash Patel has told Fox News's Sean Hannity.

"Right behind that is to find anyone and any others involved in this kidnapping case to make sure they're brought to justice", he continued.

Patel also said the FBI had worked with private sector partners to find data thought to be missing or deleted, which when put out to the public had led to tips and further interviews.

"We're not stopping" he added, saying his team were "working through the night".

Image source, NBC via Getty Images

In the Guthrie family's first video to their mothers potential abductors, Savannah Guthrie said the 84-year-old's health and heart were "fragile" and "lives in constant pain".

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

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

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

Authorities said on the night of her disappearance, the app on her pacemaker, an implanted cardiac device, disconnected from her phone.

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

The FBI are searching the residence of the person detained in connection with the Nancy Guthrie investigation under a court-authorised warrant, according to two sources familiar with the case that spoke to the BBC's US news partner CBS.

The person detained is believed to live in a house in Rio Rico, south of Tuscon and was taken into custody at a traffic stop.

Pima County Sherriff's Office have confirmed they are staging a court-authorised search of a location in Rio Rico related to the investigation.

They expect the search to last several hours.

US outlets are reporting a police operation in Rio Rico, Arizona.

The Pima County Sheriff’s Department says it is conducting a "court-authorised search" of a location in Rio Rico, in relation to the investigation of Nancy Guthrie's case, according to US outlets CNN and Fox News.

The search, supported by the FBI's Evidence Response Team, is expected to last several hours, the Sheriff's Office has told US outlets.

Fox News is reporting a large police presence including multiple police units in an area of Rio Rico.

A senior administration official tells CBS, the BBC's US partner, that the White House is monitoring the situation in Tucson closely.

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

The Guthrie family has posted several videos pleading for the release of Nancy Guthrie.

In the first video, posted on the night of 4 February, Savannah Guthrie addressed the potential abductors.

"We are ready to talk," she said. "We need to know without a doubt that she is alive and that you have her."

On 5 February, her brother Camron said in a video that the family still had not received any contact from "whoever is out there holding our mother", adding: "We want to hear from you."

The family released a third video on 6 February where Savannah Guthrie said: "We received your message, and we understand." She added: "This is very valuable to us - and we will pay."

An apparent ransom note contained two deadlines: one at 17:00 on 5 February and another on9 February.

Ahead of the reported ransom deadline on 9 February, Savannah Guthrie released another video pleading for the public to help locate her missing mother.

"I just want to share a few thoughts as we enter another week of this nightmare," she said in a the video posted on Instagram. "She was taken, and we don't know where. And we need your help."

"We have made substantial progress in the last 36-48 hours" said FBI director Kash Patel in a post on X.

"I do believe we are looking at people who, as we say, are persons of interest," he added.

Nancy Guthrie was last seen at her home in Catalina Foothills, an affluent neighbourhood roughly six miles (10km) north-east of Tucson, on 31 January evening, when family members dropped her off.

Concern grew when members of her church noticed her absence at Sunday's service andnotified her family.

This is the 10th day since Nancy Guthrie, the 84-year-old mother of news anchor Savannah Guthrie, disappeared from her home.

Here's a quick summary of where things stand:

• Authorities believe Nancy Guthrie was taken against her will from her home in Tuscon, Arizona, in the middle of the night. She was last seen on 31 January
• The police have said they detained a "person of interest" at a traffic stop south of Tucson
• Earlier on Tuesday, Savannah Guthrie said her family believes their mother is still alive. "We believe our mum is still out there," she said in an Instagram video. "We need your help."

• Also on Tuesday, the FBI released images and footage of a person in a mask and gloves, who appeared to have tampered with a doorbell camera on the day she disappeared. The person was armed, the federal bureau say

• The FBI is offering a $50,000 (£36,000) reward for information in the case

Earlier today, the FBI shared images of a person in a mask at Nancy Guthrie's home.

They were taken from a video recorded on the morning of her disappearance.

Authorities said the individual was armed.

It is not yet known whether the person who has been detained is the person from the photographs.

Image source, Provided by FBI

The police department of Oro Valley, a suburban town in Arizona, has confirmed to the BBC it was involved in a regional Swat mission tonight.

It did not confirm the details of the mission.

Nancy Guthrie disappeared in the middle of night from her home in Tucson, Arizona, and was last seen on 31 January.

In the last few moments, the Pima County Sheriff’s office released this statement:

"Earlier today, Pima County Sheriff’s Department deputies detained a subject during a traffic stop south of Tucson," the statement says.

"The subject is currently being questioned in connection to the Nancy Guthrie investigation. Additional information will be released as it becomes available."