Alternate Surveillance View Inside Nancyโ€™s House Leads Police to Identify a Second Suspect and Secure a Warrant.. ๐Ÿ‘‡๐Ÿ‘‡

Law enforcement agents have been gathering more potential evidence as the search for โ€œTodayโ€ show host Savannah Guthrieโ€˜s mother heads into its third week.

The 84-year-old was last seen at her Arizona home on Jan. 31 and was reported missing the following day. Authorities say her blood was found on the front porch. Purported ransom notes were sent to news outlets, but two deadlines for paying have passed.

Authorities have expressed concern about Nancy Guthrieโ€™s health because she needs vital daily medicine. She is said to have a pacemaker and have dealt with high blood pressure and heart issues, according to sheriffโ€™s dispatcher audio on broadcastify.com.

Hereโ€™s what to know about her disappearance and the intense search to find her:

Video of masked man

The Federal Bureau of Investigationย released surveillance videosย of a masked person wearing a handgun holster outside Guthrieโ€™s front door in Tucson the night she vanished. A porch camera recorded video of a person with a backpack who was wearing a ski mask, long pants, jacket and gloves.

On Thursday, the FBI called the person a suspect. It described him as a man about 5 feet, 9 inches tall with a medium build. The agency said he was carrying a 25-liter โ€œOzark Trail Hiker Packโ€ backpack.

Investigators initially said there was no surveillance video available since Guthrie didnโ€™t have an active subscription to the doorbell camera company. But digital forensics experts kept working to find images in back-end software that might have been lost, corrupted or inaccessible.

Studying DNA

Investigators collected DNA from Guthrieโ€™s property which doesnโ€™t belong to Guthrie or those in close contact with her, the Pima County Sheriffโ€™s Department said. Investigators are working to identify who it belongs to.

Evidence requiring forensic analysis is being sent to the same out-of-state lab that has been used since the beginning of the case, the department said.

Investigators found several gloves, the nearest about 2 miles (3.2 kilometers) from Guthrieโ€™s home, and submitted them for lab analysis, the sheriffโ€™s department said. It did not specify what type of gloves.

The sheriff stressed his department is working closely with the FBI.

Sorting through tips

The Pima County sheriff and the FBI announcedย phone numbersย and aย websiteย to offer tips. Several hundred detectives and agents have been assigned to the case, the sheriffโ€™s department said.

The FBI said it has collected more than 13,000 tips since Feb. 1, the day Guthrie was reported missing. The sheriffโ€™s department, meanwhile, said it has taken at least 18,000 calls.

The sheriffโ€™s department has not said whether any tips have advanced the investigation.

Intensive searches

Late Friday night, law enforcementย sealed off a roadย about 2 miles (3.2 kilometers) from Guthrieโ€™s home as part of their investigation. A parade of sheriffโ€™s and FBI vehicles, including forensics vehicles, passed through the roadblock.

The investigators also tagged and towed a Range Rover SUV from a nearby Culverโ€™s restaurant parking lot late Friday.

The sheriffโ€™s department said Saturday the activity was part of the Guthrie investigation, but no arrests were made.

On Tuesday, sheriff deputies detained a person for questioning during a traffic stop south of Tucson. Authorities didnโ€™t say what led them to stop the man butย confirmed he was released.

The same day, deputies and FBI agents conducted a court-authorized search in Rio Rico, about an hourโ€™s drive south of the city.

Family pleas

Savannah Guthrie, her sister and her brother have shared on social media multiple video messages to their motherโ€™s purported captor.

The familyโ€™s Instagram videos have shifted in tone from impassioned pleas to whoever may have their mom, saying they want to talk and are even willing to pay a ransom, to bleaker and more desperate requests for the publicโ€™s help.

The latest video on Thursday was simply a home video of their mother and a promise to โ€œnever give up on her.โ€

A quiet neighborhood

Nancy Guthrie lived alone in the upscale Catalina Foothills neighborhood, where houses are spaced far apart and set back from the street by long driveways, gates and dense desert vegetation.

Savannah Guthrie grew up in Tucson, graduated from the University of Arizona and once worked at a television station in the city, where her parents settled in the 1970s. She joined โ€œTodayโ€ in 2011.

In a video, she described her mother as a โ€œloving woman of goodness and light.โ€

The Associated Press contributed to this report.