Savannah Guthrie has appealed for her 84-year-old mother's release two weeks after her disappearance, telling anyone involved that "it's never too late to do the right thing."
In the US TV anchor's new video appeal, she addresses "whoever has her, or who knows where she is," and says Nancy Guthrie's loved ones "still have hope."
This comes as investigators were analyzing DNA found on a glove that appeared to match DNA worn by a suspect in doorbell camera footage taken the night Nancy Guthrie disappeared.
Authorities believe the suspect in the video kidnapped Guthrie on the morning of February 1.
The FBI said Sunday that investigators recovered the glove from a roadside field about two miles from Guthrie's home in Tucson, Arizona.
The agency collected approximately 16 gloves from various locations near his home, although most turned out to have been discarded by people searching for him.
The FBI stated, "The DNA profile associated with the recovered gloves is distinct and appears to match the gloves worn by the individual seen in the surveillance video."
The agency said it has received preliminary DNA test results on the gloves and is still awaiting "quality control and official confirmation" before entering the "unidentified male profile" into its database.
Earlier this week, investigators released footage from a doorbell camera installed on Guthrie's front door, showing a masked man wearing gloves and a backpack.
In the video, the suspect walks toward the camera and attempts to cover it with his gloved hand before lifting some bushes from the front yard to block the camera's view.
After conducting a forensic analysis of the video, the FBI announced earlier this week that they believe the man was between 5ft 9in and 5ft 10in (175-177cm) tall and of average build.
The FBI also highlighted the backpack the suspect was wearing in the video, identifying it as a 25-liter Ozark Trail hiker pack.
The County Sheriff's Department stated that the suspect's appearance "is still the primary focus," but added that "investigators are not ruling out any individuals or possibilities."
Guthrie was last seen on January 31st, when a family member dropped him off at his daughter Annie's house after a get-together.
Members of his church noticed his absence the next day and informed his family.
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In the two weeks since Guthrie's disappearance, the FBI and Pima County Sheriff's Office have launched a massive search operation involving helicopters, sniffer dogs, hundreds of officers, and thousands of call-in tips.
Authorities have warned that without medication, her health could deteriorate significantly. Pima County Sheriff Chris Nanos said Guthrie was "not in good physical health" but had no mental or cognitive impairments.
On Friday, authorities executed a search warrant at a home two miles from Guthrie's home, but made no arrests.
Local officials also said investigators found DNA at Guthrie's address that did not belong to her or anyone close to her.
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