By Elise Hammond, CNN
(CNN) — Law enforcement believes Nancy Guthrie was abducted from her bed in Arizona, but they’ve been tight-lipped about what details lead them to that conclusion about the 84-year-old mother of “Today” anchor Savannah Guthrie.
Guthrie was last seen at her home in the Catalina Foothills near Tucson Saturday night and police say time is of the essence to find her, especially since she is without crucial medication she takes daily.
When law enforcement arrived at the house Sunday, they found things that were “very concerning,” Pima County Sheriff Chris Nanos said, and that kicked off a criminal investigation.
Here are the key questions and what we know about the case.
What happened?
Guthrie was last seen Saturday when her family brought her home from dinner around 9:30 p.m., Nanos told CNN. They got her in the house and she went to bed, he said.
When she did not show up to church Sunday morning, a church member called her family, who went to her home around 11 a.m. to look for her, the sheriff said at a news conference Monday.
A family member called 911 around noon Sunday to report her missing, Nanos said, and homicide detectives were sent to the home.
“Something that they told me about that scene made me believe that there’s more than just a missing person,” Nanos said about the decision to set in motion a criminal investigation. “We still hope she’s alive and we continue with those missions of search and rescue.”
Nanos said investigators believe she was abducted from her bed “but cannot speak as to why.” Officials do not know what time Guthrie was taken, Nanos added.
What have investigators found at the house?
Law enforcement is treating Guthrie’s house as a crime scene and has described the circumstances around her disappearance as suspicious, Nanos has said.
The case is “not dementia-related,” Nanos said at a Monday morning news conference, and Guthrie is “of great sound mind” and “sharp as a tack.” But she also has limited mobility and “couldn’t walk 50 yards,” the sheriff said, leading investigators to believe she was taken from the house.
“This isn’t somebody who wandered off,” Nanos said.
“We also have some things at that scene that indicate to us that she was removed from that scene against her will. I can’t go into all those details,” Nanos said, saying it’s to protect the integrity of the case.
He also declined to give information about whether it appears Guthrie was hurt during the incident.
Asked by CNN whether Guthrie could have been part of a kidnapping-for-ransom plot, given her daughter’s high profile, Nanos said that is not the direction investigators are taking, but “we’ll never rule it out.”
Investigators also do not believe it was a home invasion or robbery gone wrong, Nanos told MS NOW, adding they’re also not dismissing that possibility, either.
Right now, “time is very critical” in finding her, the sheriff said at the news conference. Guthrie takes daily medication that “could be fatal” for her to go without, he said. However, there is no indication there is a threat to the public, Nanos said.
Who’s involved in the investigation?
Local law enforcement is leading the investigation, and FBI agents from across Arizona are “fully engaged” and offering numerous technical resources to local authorities, a law enforcement source familiar with the investigation told CNN. This includes assisting with analysis of data from cell phone towers near the Guthrie home.
A priority for investigators right now is downloading security footage from the house, he said. Private comp