US authorities investigating the disappearance of Nancy Guthrie more than a week ago have released the first surveillance images, showing a masked person on her porch the night she went missing.

Authorities searching for the mother of TV show host Savannah Guthrie have not identified any suspects of persons of interest.

FBI Director Kash Patel posted the images on X.

“The video was recovered from residual data located in backend systems,” Patel wrote, saying the images show “an armed individual appearing to have tampered with the camera at Nancy Guthrie’s front door the morning of her disappearance”.

Investigators had been hopeful that cameras at the home would turn up some evidence about how she went missing but the doorbell camera was disconnected early on Sunday.

And while software data recorded movement at the home minutes later, Nancy Guthrie did not have an active subscription so none of the footage could be recovered, Pima County Sheriff Chris Nanos had said.

Nancy Guthrie was reported missing from her home near Tucson, Arizona, more than a week ago after she did not show up at church.

She was last seen the night before her disappearance around 9.45pm after having dinner at her daughter Annie’s home.

The family had previously made several videos and posted them to Savannah’s social media, pleading for her return and telling the kidnappers that they will pay a ransom, reported to be $A8 million in cryptocurrency.

“We received your message and we understand,” Savannah Guthrie said in one of the videos, where she was seated alongside Annie and their brother, Camron.

“We beg you now to return our mother to us so that we can celebrate with her.

“This is the only way we will have peace.

“This is very valuable to us, and we will pay.”

Savannah Guthrie is one of American television’s biggest stars, hosting a top-rating breakfast show.