As the search for Savannah Guthrie’s missing mother continues, authorities say they are investigating a new message regarding her disappearance and are urging anyone with tips to contact the FBI.

NBC News has also learned that law enforcement officials in Arizona conducted a search for a vehicle or vehicles which may or may not be connected to Nancy Guthrie’s disappearance.

Heith Janke, the special agent in charge of the FBI’s Phoenix division, announced Feb. 5 that there will be a $50,000 reward for “information leading to the recovery of Nancy Guthrie and/or the arrest and conviction of anyone involved in her disappearance.”

The sheriff’s department and the FBI continue to urge anyone with tips to call 1-800-CALL-FBI.

Reports of Ransom Notes

Pima County Sheriff’s Department said Feb. 6 that it and the FBI are aware of a “new message” and investigators are actively inspecting the information in the message for its authenticity.

The department did not say what the message contains, but three officials briefed on the message told NBC News that it was an email sent to Tucson TV station KOLD earlier on Feb. 6. The FBI is trying to confirm if it was sent from the same person or persons as a first ransom note referencing Nancy Guthrie that was reported by law enforcement on Feb. 5, those officials said. The process could take some time because of technical factors involved with determining its authenticity, according to those officials.

The FBI said at a news conference Feb. 5 that a ransom note distributed to the media made a demand for 5 p.m. that day and if a transfer wasn’t made, a second demand had been made for Feb. 9. Heath Janke, the special agent in charge of the FBI’s Phoenix division, said the FBI is still investigating the legitimacy of ransom notes. He said one referenced an Apple Watch and one referenced a floodlight, information that was publicly available. Janke said the note did not include any contact information.

Janke also said that the FBI has made an arrest “related to an imposter ransom demand” and a complaint will be presented in court.

NBC News has reviewed a copy of what authorities have described as a possible ransom note sent to three news organizations referencing Nancy Guthrie and the contents are consistent with the descriptions provided by the FBI and those news outlets.

Timeline of Nancy Guthrie’s Disappearance, According to the Sheriff

Pima County Sheriff Chris Nanos on Feb. 5 shared a detailed the events on the night that Nancy Guthrie disappeared in what police believe may be an abduction or kidnapping.

Jan. 31

• 5:32 p.m.: Nancy travels to her family’s home.
• 9:48 p.m.: Family drops Nancy off at home and garage door opens.
• 9:50 p.m.: Garage door closes.

Feb. 1

• 1:47 a.m.: Doorbell camera disconnects.
• 2:12 a.m.: Software detects person on camera. No video is available due to lack of a service subscription.
• 2:28 a.m.: Pacemaker app shows disconnect from phone.
• 11:56 a.m.: Family checks on Nancy.
• 12:03 p.m.: 911 call to sheriff’s office.
• 12:15 p.m.: Patrol arrives at Nancy Guthrie’s residence.

What Savannah and Her Family Have Shared

Savannah, whom the sheriff said is in Arizona with her family, shared a video to her Instagram Feb. 5. It was posted shortly after the 5 p.m. deadline of the ransom note that law enforcement officials said they are investigating.

In the clip, Savannah’s brother, Camron, speaks to whoever may have taken their mother.

“We want to hear from you. We haven’t heard anything directly. We need you to reach out, and we need a way to communicate with you so we can move forward,” he said. “But first we have to know that you have our mom. We want to talk to you, and we are waiting for contact.”

Savannah also shared a video late Feb. 4 on Instagram alongside her brother and sister with a plea for the safe return of their mother.

“Mommy, if you are hearing this, you are a strong woman, you are God’s precious daughter,” Savannah said. “We believe and know that even in this valley, He is with you. Everyone is looking for you, Mommy, everywhere. We will not rest, your children will not rest, until we are together again.”

The siblings also addressed media reports of a ransom letter, saying, “We need to know without a doubt that she is alive and that you have her. We want to hear from you, and we are ready to listen.”

Savannah’s first statement came the morning of Feb. 2.

“On behalf of our family, I want to thank everyone for the thoughts, prayers and messages of support,” she said. “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 with information to contact the Pima County Sheriff’s Department at (520) 351-4900.”

She also shared an Instagram post late Feb. 2 in which she asked for people to pray for her mother’s return.

Blood Found at Scene was Nancy Guthrie’s, Sheriff Says

Pima County Sheriff Chris Nanos also shared additional details about the investigation at the press conference on Feb. 5.

He confirmed that blood was found on the porch of Nancy Guthrie’s home, and DNA testing revealed that it was a match for Guthrie.

The sheriff reiterated a statement from a previous press conference on Feb. 3 that DNA testing has thus far not shed any light on any possible suspects. He also reaffirmed a statement he released on Facebook on Feb. 4 that no suspect or person of interest has been identified at this time.

Nanos would not discuss reports of a forced entry at the home as far as whether there was or was not a forced entry. He added that investigators have spoken to an Uber driver who took Nancy Guthrie to the residence of her daughter earlier on Jan. 31.

After FBI agents and investigators were seen returning to Nancy Guthrie’s home in Tucson with canine units on Feb. 4, Nanos confirmed that was because the FBI and other departments partnering on the search and investigation were there to comb through the crime scene.

Law enforcement officials believe the 84-year-old mother of the TODAY co-anchor was taken from her home against her will in a “possible kidnapping or abduction” before her family reported her missing from her Arizona residence the following day.

“We believe she was taken out of the home against her will, and that’s how this investigation is moving,” Nanos said on NBC Nightly News on Feb. 2.

President Trump Has Directed Federal Resources to Assist in the Search

President Donald Trump shared on Feb. 4 that he spoke with Savannah on the phone and is assigning more resources to assist in the search.

“I am directing ALL Federal Law Enforcement to be at the family’s and Local Law Enforcement’s, complete disposal, IMMEDIATELY,” he wrote on Truth Social. “We are deploying all resources to get her mother home safely.”

What Officials Have Said About Nancy Guthrie’s Health

Nancy Guthrie does not have cognitive issues, Nanos said at a Feb. 2 press briefing, but has physical challenges and is in need of medication that can be fatal if not received within 24 hours.

“She is very limited in her mobility. We know she didn’t just walk out of there,” Nanos said. “There were other things at the scene that indicate that she did not leave on her own.”

Nanos added that Guthrie “could not walk 50 yards by herself.”

Two senior officials briefed on the investigation told NBC News late Feb. 4 that Nancy Guthrie’s pacemaker appears to have disconnected from its monitoring app in the early morning hours on Feb. 1.

Other Details Police Have Released About Nancy Guthrie’s Disappearance

Nancy Guthrie’s family told police they were alerted to her disappearance when they received a call from someone at their local church saying she was not there. The family then went to her house and searched for her before calling police.

Authorities are in possession of Nancy Guthrie’s cell phone, according to Nanos. She lives alone and had house staff, some of whom have been in touch with law enforcement, according to the sheriff.

Police do not know if Nancy Guthrie was targeted because she is Savannah’s mother and are not aware of threats aimed at Savannah after speaking with her, Nanos said.

Nanos added that he does not believe the public is in any danger.

Nancy Guthrie is described as 5 feet, 5 inches tall, weighing 150 pounds, with brown hair and blue eyes. Her family last saw her at home around 9:30 p.m. to 9:45 p.m. on Jan. 31, Nanos said.

On Feb. 6, NBC News became aware that officers are searching for a vehicle or vehicles which may or may not be connected to Nancy Guthrie’s disappearance. Officials have not stated if the car or cars in question are definitively connected to any part of the crime or if that lead has since evaporated.

A spokesperson for the gas station chain Circle K told NBC News that law enforcement visited one of their stores located on Oracle Road in Tucson, Arizona, after “receiving a tip regarding a vehicle of interest, and our team has provided them access to the store’s surveillance video.”