The FBI has increased its reward and released new images as part of its investigation into the suspected abduction of US television host Savannah Guthrie’s mother, Nancy, from her southern Arizona home.
What began as a missing person case quickly escalated into an FBI-led suspected kidnapping investigation.
New images of a backpack were also released to the public. (Supplied: FBI)
The 84-year-old has been missing for 13 days.
The case has captured international attention and has prompted online sleuths to flood the internet with conspiracy theories.
Savannah Guthrie has not been on the Today Show since the disappearance of her mother, Nancy. (Supplied: Instagram)
The FBI has raised its reward to up to $US100,000 ($141,000) for information leading to the location of Nancy Guthrie or the conviction of anyone involved in her disappearance.
New images of a backpack were also released to the public.
The suspect was seen wearing a black, 25-litre “Ozark Trail Hiker Pack” backpack. (Supplied: FBI)
The development followed the FBI’s earlier release of footage and images of a masked, suspected abductor captured by Nancy Guthrie’s doorbell camera.
The suspect was described as a male, between 175cm and 179cm tall, with an average build.
In the video, he was seen wearing a black, 25-litre “Ozark Trail Hiker Pack” backpack.
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In a post on social media, the FBI said, “we hope this updated description will help concentrate the public tips we are receiving”.
“The FBI has collected over 13,000 tips from the public related to this case,” the post said.Nancy Guthrie kidnapping investigation timeline
“Every tip is reviewed for credibility, relevance, and information that can be acted upon by law enforcement.”
Previously, local police said DNA tests showed blood on Nancy Guthrie’s front porch matched her, and that a doorbell camera was disconnected in the early hours of Sunday morning.
They also said Ms Guthrie’s pacemaker disconnected from her phone about half an hour later.
Nancy Guthrie required daily medication for high blood pressure and heart issues.
The home of Nancy Guthrie in Tucson, Arizona. (AP: Caitlin O’Hara)
Family say they will never give up
Savannah Guthrie shared a video montage of her mother on Instagram with the caption, “our lovely mom”.
“We will never give up on her,” the post said.
“Thank you for your prayers and hope.”
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The host of NBC’s Today show has previously posted several surveillance images, writing: “We believe she is still alive. Bring her home,” alongside phone numbers for the FBI and the county sheriff.
She later shared surveillance images on social media.
The longtime media personality and her two siblings have indicated a willingness to pay a ransom.
It is not known whether ransom notes demanding money, with deadlines that have already passed, were authentic or whether the family had any contact with whoever was responsible.
ABC/wires