Nancy Guthrie disappearance: Prosecutors visit crime scene, over 1,600 tips since increased reward

Retired NYPD detective and national security expert Pat Brosnan reviewed the video with his team. He tells Fox News Digital they believe the vehicle seen at 2:36 a.m. is a Kia Soul, based on its slanted roof, window design and rear-quarter glass. He also noted the vertical break lights.

A Ring doorbell camera captured multiple vehicles driving along a back road near Nancy Guthrie’s Catalina Foothills neighborhood around the time authorities believe the 84-year-old was abducted.

The footage, obtained exclusively by Fox News Digital, shows 12 cars passing between midnight and 6 a.m. on Feb. 1. One vehicle was recorded at approximately 2:36 a.m. — about eight minutes after Guthrie’s pacemaker last synced with her iPhone, according to the Pima County Sheriff’s Department timeline.

The homeowners, Elias and Danielle Stratigouleas, live about 2.5 miles from Guthrie’s home on a road that leads out of the neighborhood while avoiding major intersections. They told Fox News Digital law enforcement had not canvassed their street in the weeks following the suspected home invasion kidnapping.

The FBI and Pima County Sheriff’s Department have been alerted to the footage. It is unclear whether the vehicles are connected to the case.

This is an excerpt from report by Fox News Digital's Michael Ruiz and Olivia Palombo.

A Fox Flight Team drone captured workers appearing to install or repair a surveillance camera at Nancy Guthrie’s Tucson-area home Thursday, as activity at the property intensified amid an ongoing federal presence.

Video from above shows at least two workers positioned near the roofline of the residence, focusing on what appears to be a mounted security camera. Equipment trucks were parked nearby as crews moved around the property.

The activity comes on a day marked by a steady stream of vehicles entering and exiting the residence. The home’s garage door has remained open for hours, with multiple cars observed coming and going throughout the day.

Fox News' Matt Finn contributed to this report.

Over 1,600 tips have been sent to the FBI since Savannah Guthrie announced a family reward of up to $1 million for the recovery of Nancy Guthrie, according to a source familiar with the investigation.

In an Instagram video on Tuesday morning, Savannah Guthrie announced a family reward of up to $1 million for the recovery of Nancy Guthrie, her mother. The family is also making a $500,000 donation to the National Center for Missing and Exploited Children, she said.

A source familiar with the investigation told Fox News Digital that over 1,600 new tips have been sent to the FBI since the increased reward was announced.

A retired FBI agent explained that a "smaller visible footprint" doesn't mean the federal agency is pulling resources away from the Nancy Guthrie investigation.

Sources told Fox News that the FBI will reduce the number of its personnel in Tucson, Arizona and relocate the command post to Phoenix in the search for Nancy Guthrie.

The spokesperson also told Fox News that "boots on the ground" is operating in Tucson and "intel" is operating in Phoenix. There's no reduction of the total number of workers on the case, the spokesperson added.

Retired FBI Agent Jason Pack told Fox News Digital that the investigation "is still running at full speed."

"Leads are still being worked. Video is still being reviewed. Digital evidence is still being analyzed. And here is something most people do not realize about modern FBI investigations. A lot of that work does not require boots on the ground in Tucson. It can be done from field offices anywhere in the country," Pack said.

The former FBI agent had a message for Americans following the case: "Do not let the smaller visible footprint fool you."

"Those specialized resources that just stood down are not gone. They can be back on the ground quickly if something breaks in this case," he added.

The FBI will reduce the number of its personnel in Tucson, Arizona and relocate the command post to Phoenix in the search for Nancy Guthrie, sources told ABC News.

While there will still be FBI agents in Tucson, many agency personnel will return to Phoenix, where they're based, according to the report. The FBI will continue to work with the Pima County Sheriff's Office.

The sources said that the move isn't an indication that investigators are giving up or a signal that the case is over, the sources added.

An FBI spokesperson told Fox News that "boots on the ground" is operating in Tucson and "intel" is operating in Phoenix. There's no reduction of the total number of workers on the case, the spokesperson added.

On Wednesday, federal prosecutors visited Nancy Guthrie's property to assist the FBI with a "routine legal process," the United States Attorney’s Office for the District of Arizona confirmed to Fox News Digital.

Fox News Digital's Michael Ruiz contributed to this report.

TUCSON, Ariz. — Whoever abducted Nancy Guthrie may have left behind crucial digital evidence — even if they thought they covered their tracks, according to a forensics expert who helped solve the Idaho student murders.

Authorities have released few details about any evidence aside from DNA samples collected so far, but Heather Barnhart, a digital forensics expert with Cellebrite and the SANS Institute, said cell tower data, Wi-Fi logs and other digital breadcrumbs could prove critical.

"The loudest evidence can be the lack of evidence," she told Fox News Digital.

Barnhart, who analyzed the phone and computer of Bryan Kohberger, told Fox News Digital that criminals often underestimate how difficult it is to truly disappear in a world saturated with connected technology.

Click here to read more on Fox News Digital