A drone view shows investigators searching the home of Nancy Guthrie, in Tucson, Arizona, on Friday, February 6.

Rebecca Noble/Reuters

Investigators were seen in drone footage swarming Nancy Guthrie’s home Friday evening near Tucson, Arizona, as the FBI and the Pima County Sheriff’s Department resumed searching the property and surrounding area, just hours after CNN affiliate KOLD-TV said it received a new message about the 84-year-old mother of “Today” host Savannah Guthrie.

Local and federal investigators said they are aware of a “new message,” which is being examined for its authenticity in an investigation being led by the FBI. Earlier this week, several media outlets, including TMZ and KOLD, received messages demanding millions of dollars in bitcoin for Nancy Guthrie’s return.

Authorities continue to urge anyone with tips to contact them, with the FBI offering a reward of up to $50,000 for information leading to Guthrie’s recovery as the family continues to plead for help in finding their beloved mother.

Here are the latest developments in the case, as Guthrie’s disappearance stretches into its sixth day with still no suspects named:

New message: The first ransom note sent to media outlets earlier this week included two deadlines, one at 5 p.m. Thursday and another set for Monday. A second message on Friday included sensitive information, no deadline, and did not appear to be for a ransom, according to KOLD anchor Mary Coleman, who saw both notes. Without providing more details about the second letter’s contents, Coleman said she thinks the sender made an effort to include details they think will prove to investigators it is the same person or people who sent the first.

Fake ransom note: A man who was charged for making an illegitimate ransom threat to Guthrie’s family was released on a $20,000 bond, following a court appearance Friday, the US Attorney’s Office for the Central District of California said. Derrick Callella, 42, did not enter a plea and is not allowed to contact any victims or witnesses related to the case, as he is accused of sending a threat to the daughter and son-in-law of Guthrie shortly after the family posted a plea for help on social media, the criminal complaint said.

DNA evidence at home: DNA submitted as part of the investigation into Guthrie’s disappearance came back “quickly,” revealing blood found on the porch of her home belonged to her, Pima County Sheriff Chris Nanos said Thursday. DNA from what investigators believed was the “best target” for suspect material returned minimal results, he said. A security camera from the front‑door area of the home is missing and it is unclear which of the cameras at the home detected motion at around 2 a.m. on Sunday, around the time her pacemaker last pinged her phone. The Arizona Department of Public Safety is offering rapid DNA analysis and is coordinating with local law enforcement on the case, said Gov. Katie Hobbs.

The latest note sent to local news station KOLD on Nancy Guthrie’s disappearance doesn’t appear to be for a ransom, anchor Mary Coleman told CNN’s Kaitlan Collins.

This note appeared to be “a response to the initial videos that the family put out,” Coleman said this evening, but didn’t share details to protect law enforcement’s investigation. The Guthrie family had released videos on social media pleading for help with finding their mother.

“Typically a ransom note, there’s a cause and effect kind of thing. And I don’t see that in this note,” she said.

It’s not clear why the sender appeared to have submitted another note to her newsroom, but it might be because their system allows people to submit anonymous tips, she said. Law enforcement hasn’t shared any information on why their newsroom was chosen, she added.

Retired FBI agent Richard Kolko appears on CNN on Friday, February 6.

CNN

With multiple media outlets now receiving purported ransom notes from Nancy Guthrie’s alleged abductor, a former senior FBI crisis negotiator says the possible open line of communication is a welcomed development.

“It says that that’s the path that they’ve chosen,” retired FBI agent Richard Kolko told CNN’s Anderson Cooper. “But let me make it clear: As a negotiator, you want to make it as easy as possible for the hostage takers to be able to communicate with you, whatever that takes.”

Kolko added, “If they want to go through the TV station, that’s fine, as long as you get this line of communication established, and then you can determine that the hostage takers are the real people involved. We’ll do whatever we can to communicate with them.”

While some of the still unverified ransom notes have demanded deadlines for the payment of a ransom, one received by CNN affiliate KOLD-TV Friday contained sensitive information but did not mention a deadline, the station reported. Kolko said experience dictates deadlines can shift.

“The FBI routinely talks through deadlines,” he said” “I know it’s a lot of stress on the families, a lot of stress on law enforcement. But this could be extended, because if they’re in it for the business deal, they’re going to do everything they can to keep her alive so that they can complete their part of the deal.”

CNN’s Ed Lavandera speaks to Shirley Harvey, a neighbor of Guthrie’s, on Friday, February 6.

CNN

As the hours pass since Nancy Guthrie disappeared from her home outside of Tucson, “Everybody’s frustrated that there is no answers,” Shirley Harvey, one of Guthrie’s neighbors, told CNN’s Ed Lavandera Friday.

“People are in shock because we still don’t know where she is,” Harvey said, as helicopters flew low overhead and police scoured the secluded Catalina Foothills community.

She never would have imagined a crime like Guthrie’s possible abduction taking place in the neighborhood, Harvey said.

Harvey said she finds herself ruminating often on the circumstances around 84-year-old Guthrie’s disappearance. “It’s just a very unnerving thing to happen to somebody, especially an elderly woman,” she said.

Surveillance cameras at people’s homes seemingly have not captured any footage of the abduction, which she said is frustrating.

But she pointed out many cameras are “really designed to see who’s coming into your house,” and many homes in the area do not face the street.

“It doesn’t surprise me that there hasn’t been good video surveillance,” she said.

CNN’s Anderson Cooper talks with CNN law enforcement analysts John Miller and Jonathan Wackrow about a new message sent to CNN affiliate KOLD related to Nancy Guthrie and the law enforcement response seen around her house tonight.

An image taken from drone footage shows investigators on the roof of Guthrie’s home on Friday, February 6.

CNN

Drone footage shows gloved investigators buzzing over Nancy Guthrie’s property Friday evening, placing evidence markers and climbing onto the flat, stark white roof of her home. As the sun set, flashlight beams fanned across the landscaping as agents peered into bushes and scoured the ground.

The FBI and sheriff’s office have resumed searches at Guthrie’s home and in the surrounding area as her disappearance stretches into its sixth day, CNN has reported. The street leading to the home has been cordoned off by orange cones and Pima County Sheriff’s Department vehicles.

“Neighbors tell us they’ve actually been searching areas around the home, knocking on doors, reinterviewing neighbors, asking for any kind of evidence or video,” CNN’s Ed Lavandera reported from the scene Friday.

Investigators have been going door-to-door speaking to residents in Guthrie’s neighborhood and the surrounding communities, Sheriff Chris Nanos said Thursday.

For some residents, especially those who knew Guthrie, the situation feels almost surreal.

“I wish there was something more I can do,” said neighbor Laura Gargano, who has lived around the corner from Guthrie for 11 years. “It almost feels like time is standing still right now, that it almost feels inappropriate to go on and continue with our lives.”

Though investigators have returned to Guthrie’s home at least twice this week, this evening’s law enforcement presence is much heavier than it has been in previous days.

The surge in investigative presence comes just hours after local TV station KOLD said it received a new message about Guthrie which is being examined by the FBI.