A timeline of Nancy Guthrie's disappearance as search for Savannah Guthrie's mom stretches into 2nd week

The search for "Today" show co-host Savannah Guthrie's mother is stretching into a second week as authorities still work to identify a possible suspect — or suspects — and motive in the 84-year-old's disappearance.

Nancy Guthrie was reported missing on SundayFeb.1after not showing up for churchand the sheriff said it appears she was abducted from her home in TucsonArizona. Her family is pleading for her return. 

Savannah Guthrie has appealed directly to whoever may have taken her mother. The FBI says it is taking two emails seriouslyincluding what appears to be a ransom note with a second deadline set for later on Monday.

Here is a timeline of Nancy Guthrie's disappearance.

Saturday nightJan. 31: Nancy Guthrie last seen

Nancy Guthrie was last seen on Saturday nightauthorities said. She arrived at her daughter Annie's home at 5:32 p.m. She dined there and was dropped off at her own home after dinner at around 9:48 p.m. 

She was dropped off at home by her son-in-lawTommaso Cioni. Police say he waited until Nancy Guthrie was inside before driving off.

Pima County Sheriff Chris Nanos said at a news conference Thursday that her garage door closed at 9:50 p.m.at which time authorities assume Nancy Guthrie was home and going to bed. 

Sunday morningFeb. 1: Not at church

A doorbell camera at Nancy Guthrie's home disconnected at 1:47 a.m.and software detected someoneor possibly an animalon a camera about 25 minutes laterNanos said Thursdaybut he noted no video is available. 

Guthrie's pacemaker app showed a disconnect from her phone at 2:28 a.m. 

On Sunday morninga friend called Guthrie's familytelling them she had not shown up for church. They notified the sheriff's department around noon that dayminutes after checking in on her. 

Once police arrived at the home at 12:15 p.mthey determined Nancy Guthrie was missing under "concerning" circumstances.

Guthrie has limited mobility and relies on daily medication for her healthofficials have said. That prompted an urgent search for her in Arizona on Sunday night.  

MondayFeb. 2: Sheriff says "I believe she was abducted"

Pima County Sheriff Chris Nanos confirmed on Monday that her disappearance was being treated as a crimeand urged neighbors to review home video camera footage. 

"We saw some things at the home that were concerning to us," Nanos told reporters. "We believe now after we've processed that crime scene that we do in fact have a crime scenethat we do in fact have a crimeand we're asking the community's help."

He told CBS News he believed Guthrie was "abducted" in the middle of the night.

"I believe she was abductedyes," Nanos said. "She didn't walk from there. She didn't go willingly."

A missing person's flier from the sheriff's department described her as 5 feet5 inches tallwith brown hair and blue eyes and weighing 150 pounds.

TuesdayFeb. 3: Ransom note and blood at scene

On Tuesdayauthorities said they were analyzing an apparent ransom note with details about what the 84-year-old was wearing on the night of the crime. The note demanded payment in bitcoin.

"We are aware of reports circulating about possible ransom note(s) regarding the investigation into Nancy Guthrie," Pima County Sheriff Chris Nanos said in a social media statement. "We are taking all tips and leads very seriously. Anything that comes ingoes directly to our detectives who are coordinating with the FBI."

They were also looking at what appeared to be drops of blood outside the front door. A law enforcement source also told CBS News some was also found inside the house.

The blood found outside Nancy Guthrie's home has been confirmed to be hersNanos later saidadding that investigators were awaiting results from additional samples.

Authorities said surveillance video from the home had led nowhereand there was still no suspect.

"Nothing has come up that says'Here he ishere's your bad guy,'" Nanos told CBS News on Tuesday.

WednesdayFeb. 4: Video appeal from Savannah Guthrie

Authorities said Wednesday morning that investigators still had not identified a suspect or person of interest in the case.

"Detectives continue to speak with anyone who may have had contact with Mrs. Guthrie," the Pima County Sheriff's Department said on social media. 

On Wednesday nightthe FBI was back at Nancy Guthrie's homeusing canines to search as they worked to track down every lead. 

MeanwhileSavannah Guthrie released an emotional video pleading for her mother's return and saying her family is "ready to talk."

"We live in a world where voices and images are easily manipulated. We need to know without a doubt that she is alive and that you have her," Savannah Guthrie said in the video with her two siblingsaddressing a possible captor or captors. "We want to hear from youand we are ready to listen. Pleasereach out to us."

Savannah Guthrie said her mother's health and heart are fragile. 

"She lives in constant pain. She is without any medicine. She needs it to survive. She needs it not to suffer," Savannah Guthrie said.

She also addressed her mom directlysaying: "Mommyif you are hearing thisyou are a strong woman. You are God's precious daughterNancy. We believe and know that even in this valleyHe is with you. Everyone is looking for youmommyeverywhere. We will not restyour children will not restuntil we are together again."

Around the same time that video was releasedPresident Trump said on social media that he spoke with Savannah Guthrie "and let her know that I am directing ALL Federal Law Enforcement to be at the family'sand Local Law Enforcement'scomplete disposalIMMEDIATELY."

"We are deploying all resources to get her mother home safely," he posted.

ThursdayFeb. 5: "Still out there"

Pima County Sheriff Chris Nanos said at a news conference Thursday"We believe Nancy is still out there." He also said that as of late morning local timeauthorities had not identified a suspect or a person of interest.

A ransom note that investigators said they're taking seriously included a deadline of 5 p.m. ThursdayHeith Jankethe special agent in charge of the FBI's field office in Phoenixsaid at the news conference. 

"If a transfer wasn't madethen I think a second demand was for next Monday," Janke said. He wouldn't provide details about what the note said would happen if the demands weren't met.

Separatelyan alleged impostor was arrested for making a phony ransom demand in the caseJanke said.

Authorities are continuing to ask for the public's help and urging anyone with possible information to contact them. The FBI announced a $50,000 reward for information leading to Nancy Guthrie's recovery or the arrest and conviction of people involved in her disappearance.

"It only takes one tipjust oneto break the case opento offer that lead that we so desperately need in this case," chief of detectives for the Pima County Attorney's OfficeFabian Pachecowho oversees one of the tip linestold CBS News in an interview that aired on "CBS Mornings" Thursday. 

He said about 10% of leads have value.

Anyone with information is being urged to call (520)-882-7463.

In a video posted to Savannah Guthrie's Instagram account on Thursday nighther brother Camron Guthrie made another appeal for the return of their mother.

"Whoever is out there holding our motherwe want to hear from you," Camron Guthrie said. "We haven't heard anything directly. We need you to reach outand we need a way to communicate with you so we can move forward. But firstwe have to know that you have our mom. We want to talk to youand we are waiting for contact."

FridayFeb. 6: Authorities say they're "aware of a new message"

A second message was sent to CBS News' Tucson affiliate KOLD on Friday. The station said it would not release details about its contentsciting respect for the family and the investigation.

Local and federal authorities said they're "aware of a new message" regarding Nancy Guthrie's disappearance.

"Investigators are actively inspecting the information provided in the message for its authenticity," the Pima County Sheriff's Department said in a post on social media. The FBI also posted a similar statement on social media. It's unclear what kind of message it is.

In another social media post just after 4 p.m. local time Fridaythe sheriff's department said investigators were "conducting follow-up" at the home of Nancy Guthrie and "surrounding areas."

FBI agents removed a camera from the roof of Nancy Guthrie's home and towed a dark-colored SUV from her garage.   

SaturdayFeb. 7: Savannah Guthrie says "we will pay" for Nancy's safe return

Savannah Guthrie and her two siblings posted a new video to social media Saturday that appeared to be directed at the alleged abductor or abductorsin which she acknowledged having "received a message," and said that the Guthrie family would be willing to pay to see the safe return of Nancy Guthrie. 

"We received your message and we understand," Guthrie said in the short videoappearing alongside her siblings Annie and Camron Guthrie. "We beg you now to return our mother to us so that we can celebrate with her. This is the only way we will have peace. This is very valuable to us and we will pay."  

An FBI spokesman said Savannah Guthrie was referring to the message sent to KOLD the day beforeThe Associated Press reported. 

A few hours after the video was releasedinvestigators went to the home of Nancy Guthrie's daughter Anniewhere she had dinner the night before she disappeared. They were there for about 2.5 hours and focused primarily on the garage of the home.

Two law enforcement sources told CBS News on Saturday that investigators were "developing good information" but that "nothing is imminent."

SundayFeb. 8: Detectives back at the scene

Sheriff detectives were at Nancy Guthrie's home on Sundayfocusing on the property's perimeter along the backyard. Investigators also searched what appeared to be a septic tank in the backyard.

MondayFeb. 9: Savannah Guthrie pleads for public's help

A second ransom deadline was looming Monday as the search for Nancy Guthrie entered its second week. 

CBS News has learned investigators are canvassing nearby gas stations in an effort to track down any suspicious vehicles captured on surveillance cameras around the time Nancy Guthrie went missing.

A sheriff's deputy will now be stationed outside Nancy Guthrie's homearound the clockfor security purposes. 

On Monday afternoonSavannah Guthrie issued a plea for the public's assistancesaying the family is "at an hour of desperation and we need your help." 

"Law enforcement is working tirelessly around the clock trying to bring her hometrying to find her," Savannah said of her mom. "She was taken and we don't know whereand we need your help." She asked the public"even if you're far from Tucson," if someone sees or hears anythingor "if there's anything at all that seems strange to you," to report it to law enforcement.

The FBI reiterated that the agency has not identified a suspect or person of interest in the case so far. 

Anyone with possible information on Nancy Guthrie's disappearance is asked to call 520-882-7463. 

TuesdayFeb. 10: Surveillance images released

The FBI and the Pima County Sheriff's Department in Arizona posted surveillance images and video of a subject in Nancy Guthrie's disappearanceshowing a masked person wearing a backpack and gloves at her door.

The FBI said law enforcement agencies were able to recover data of the previously inaccessible images from the home security camera system.

The images show an armed individual appearing to have tampered with the camera at her front door on the morning Guthrie went missing. A 27-second video shows the person approaching the front door and raising a gloved hand to the camera before walking away. A 14-second video shows the person facing the camera and holding a flashlight in their mouth before covering the camera lens with some vegetation.      

Two law enforcement sources told CBS News the man in the images is considered a subject that they are seeking to identify.

Savannah Guthrie reacted to the images, writing on social media: "We believe she is still alive. Bring her home."