The mystery surrounding the disappearance of the 84-year-old mother of NBC News anchor Savannah Guthrie has deepened.


Nancy Guthrie disappeared in the middle of the night from her home in Tucson, Arizona, on January 31, and authorities believe she was taken against her will.


Police in Arizona have not yet identified a person of interest in the suspected abduction and continue to investigate a series of apparent ransom notes that may have been sent from the person or people behind the alleged crime.


The Guthrie family has made several public pleas for her safe return, asking for proof that their mother is still alive.


When did Nancy Guthrie go missing?


Guthrie was last seen at her home in Catalina Foothills, an affluent neighborhood roughly six miles (10 km) northeast of Tucson, on January 31 evening, after family members dropped her off around 9:30 PM local time.


At 01:47 local time on February 1, a doorbell camera at her home was disconnected and removed.


Concern grew when members of her church noticed her absence at Sunday\'s service and notified her family. After the family called 911, authorities initiated a search that soon included volunteers and federal officers from Border Patrol, extending into the next morning.


More than a week later, officials released videos showing a masked person, alleged to be armed, at her doorstep the night she disappeared.


Police found blood on Nancy Guthrie's porch, and analysis confirmed it was hers. Authorities warned that she may be in dire health without her medications.


She is described as not in good physical health but has no reported cognitive issues, according to Pima County Sheriff Chris Nanos.


What did the alleged ransom notes say?


The FBI has been reviewing a possible ransom note sent to several media outlets, containing details about items at Nancy Guthrie's home. On February 6, they announced they had arrested a person for a fake ransom note.


Nancy's family made an emotional plea, ready to engage with the abductors to ensure her safe return. Savannah Guthrie stated, We are ready to talk... Please, reach out to us. The family has also offered a reward of $50,000 for information leading to Nancy's whereabouts.