Authorities block road near Nancy Guthrie’s home

Law enforcement investigating the disappearance of US television presenter Savannah Guthrie’s mother has closed a road near Nancy Guthrie’s home.

A parade of sheriff’s and FBI vehicles, including forensic vehicles, passed a roadblock set up about 2 miles from the Arizona home on Friday.

The Pima County Sheriff’s Department said the incident is part of the Guthrie case.

However, it was stated that no further information was available because it was a joint investigation with the FBI.

Guthrie, 84, was reported missing on February 1.

Authorities say his blood was found on the front porch of his Tucson-area home.

Supposedly ransom notes were sent to news outlets, but two deadlines for payment have passed.

Authorities expressed concerns about Guthrie’s health because he required daily medication.

He is said to have a pacemaker and deals with high blood pressure and heart problems.

Investigators reviewed surveillance video, sorted through thousands of clues and submitted DNA and other evidence for laboratory analysis.

The FBI said it has collected more than 13,000 tips since Guthrie was reported missing.

The sheriff’s department said it received at least 18,000 calls.

On Tuesday, authorities released footage showing an armed, masked man standing outside Guthrie’s door the night he was abducted.

The videos, less than a minute in total length, gave investigators and the public the first glimpse of who was outside Guthrie’s home in the hills outside Tucson.

Experts say the video may contain a wealth of clues.