Police have released a man hours after they detained him in connection to the disappearance of Nancy Guthrie, the mother of US news anchor Savannah Guthrie, CBS News, the BBC's US partner, has reported.

After taking the man into custody at a traffic stop, police searched his home in Rio Rico, south of Tucson, Arizona, sources familiar with the investigation told CBS News.

Following his release, the man, identified only as Carlos, told reporters outside his home that he was unaware of Nancy Guthrie's identity, stating, 'I don't follow the news.'

Guthrie, 84, was last seen at her home near Tucson more than a week ago, prompting a widespread search and urgent appeals from her family.

'I'm hoping they get the suspect, because I'm not it,' Carlos noted. He claimed to have noticed that authorities were trailing him during his day-to-day activities.

Carlos shared that officers did not interrogate him and made him wait for hours in a parking lot. His mother-in-law described how law enforcement had overstepped, saying, 'They're just invading my property.'

The Pima County Sheriff's Department confirmed that police were conducting a court-authorized search at a property in Rio Rico, following the FBI's recent release of images and videos featuring a masked individual at Nancy Guthrie's front door on the night of her disappearance, indicating that this person was armed.

The FBI Director, Kash Patel, reported new images showing this armed individual tampering with the camera at Guthrie's home, after which the recordings became unavailable due to potential removals or corruptions.

Savannah Guthrie had previously shared footage on social media asking the public for help in locating her mother, emphasizing the urgency due to Nancy's fragile health condition and need for her medication.

Authorities have also announced that they are investigating ransom notes believed to connect to her abduction, with Savannah and her siblings continuing to release emotional appeals for information regarding Nancy's whereabouts. The FBI is offering a $50,000 reward for information in the case.