The FBI is moving its command post in theNancy Guthrieinvestigation from Tucson, Arizona, to Phoenix, a law enforcement source familiar with the investigation told CBS News on Thursday.
The transition is being done because the large Phoenix command post will be able to operate more efficiently for the long term, and most of the agents who have been working on the investigation in Tucson are based in Phoenix, the source said.
The investigative squads,evidencerecovery teams and SWAT teams will all remain in Tucson as they are assigned to the FBI's Tucson office, which is a large satellite office.
Guthrie, the 84-year-old mother of "Today" show co-host Savannah Guthrie, was reported missing on Feb. 1, sparking a massive search effort.
The investigation is still running at full speed, the source said. Leads are still being worked, andvideo footageis still being reviewed. Digital evidence, including cellphones, is being analyzed. Tips are still being followed.
The source said a lot of the work going forward does not require boots on the ground in Tucson and can be done from Phoenix or offices anywhere in the country.
A second law enforcement source briefed on the investigation said when a major case breaks, the FBI surges resources fast. It brings in extra agents, stands up a command post and throws everything at the time-sensitive work that has to happen in those initial critical days.
That work includes neighborhood canvases, evidence collection and running down every lead as soon as it comes in, the source said. That work in the Guthrie case is now done.
The source familiar with the investigation noted that those specialized resources, including the hostage rescue team from Quantico, Virginia, are always readily available. They can be back on the ground in Tucson quickly if something breaks in the case.
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A spokesperson for the Pima County Sheriff's Department told CBS News on Thursday that investigators were also aware of a video circulating on social media that allegedly shows a vehicle within a couple of miles of Nancy Guthrie's home at around 2:30 a.m. on Feb. 1, the day she was reported missing.
"We are aware of the video, I'm told that the property appears to be a bit further from the Guthrie home," the spokesperson said. "We asked homeowners in the area to submit video and encourage anyone who hasn't, to please do so viathis link."
CBS News has not verified the video or the location that it shows. The video was first reported by Fox News.
Authoritieshad previously reportedthat a Nest doorbell camera at Nancy Guthrie's home disconnected at 1:47 a.m. on Feb. 1. Then at around 2:12 a.m., the Nest cameras detected what it classified as a person.
The FBI has received more than 23,600 tips since Guthrie's disappearance. More than 1,500 of those tips have come in since the family offered arewardof up to $1 million this week, according to a law enforcement source.
Meanwhile, Nancy Guthrie's house will soon bereturned to her family, a law enforcement source said.
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