Law enforcement investigating the disappearance of US Today show host Savannah Guthrie's mother sealed off a road near Nancy Guthrie's home in Arizona.
Law enforcement investigating the disappearance of US Today show host Savannah Guthrie's mother sealed off a road near Nancy Guthrie's home in Arizona late on Friday night (local time).
A parade of sheriff’s and FBI vehicles, including forensics vehicles, passed through the roadblock that was set up about 3.2 kilometres from the house.
The Pima County Sheriff’s Department said the activity was part of the Guthrie investigation but declined to detail specifics.
READ MORE: Man, 85, kidnapped by mistake from Sydney home
Guthrie, 84, was reported missing on February 1.
Authorities say her blood was found on the front porch of her Tucson-area home.
Purported ransom notes were sent to news outlets, but two deadlines for paying have passed.
READ MORE: Two dead in Sydney crash allegedly involving stolen car
Authorities have expressed concerns Guthrie’s health because she needs daily medication.
She is said to have a pacemaker and has dealt with high blood pressure and heart issues, according to sheriff’s dispatcher audio on broadcastify.com.
Investigators have studied surveillance video, sorted through thousands of tips and submitted DNA and other evidence for laboratory analysis.
READ MORE: Chilling images could hold valuable clues on kidnapped mother
READ MORE: 'Priceless' Egyptian artifacts stolen in Queensland museum heist
The FBI said it has collected more than 13,000 tips since February 1, the day Guthrie was reported missing.
The sheriff’s department, meanwhile, said it has taken at least 18,000 calls.
On Tuesday, authorities released footage showing an armed, masked person at Guthrie’s doorstep on the night she was abducted.
The videos — less than a combined minute in length — gave investigators and the public their first glimpse of who was outside Guthrie’s home in the foothills outside Tucson.
Experts say the video could contain a mountain of clues.
NEVER MISS A STORY: Get your breaking news and exclusive stories first by following us across all platforms.
- Download the 9NEWS App here via Apple and Google Play
- Make 9News your preferred source on Google by ticking this box here
- Sign up to our breaking newsletter here
Grandfather kidnapped in case of mistaken identity from Sydney home
Two women killed after allegedly reckless driver in stolen car crashes
Three people rescued after becoming trapped in floodwaters as heavy rain lashes Queensland
Four-hour Melbourne siege ends as man bitten by police dog
'Priceless' Egyptian artifacts stolen in Queensland museum heist
La Niña on the way out as experts flag possibility of El Niño within months
Chilling images from Nancy Guthrie's porch could hold valuable clues
New God of War game headlines 'epic' PlayStation State of Play event
Who is Angus Taylor? The man who wrestled Liberal leadership from Sussan Ley
Disability advocates call for 'life-changing' reform
Sussan Ley to quit politics after crushing leadership defeat
