The sheriff investigating the apparent abduction of "Today" show host Savannah Guthrie's mother said Friday he was frustrated that a camera at Nancy Guthrie 's home wasn't able to capture images of anyone the day she went missing.

Investigators have found that the home's doorbell camera was disconnected early Sunday and that software data recorded movement at the home minutes later. But Nancy Guthrie did not have an active subscription, so none of the footage was able to be recovered.

"It is concerning, it's actually almost disappointing because you've got your hopes up," Pima County Sheriff Chris Nanos told The Associated Press in an interview at the department's headquarters. "OK, they got an image. 'Well, we do, but we don't.'"

The frantic search for 84-year-old Nancy Guthrie has entered a sixth day. Authorities have not identified any suspects or ruled anyone out, Nanos said at a news conference Thursday.

Authorities think she was taken against her will from her home just outside Tucson over the weekend. DNA tests showed blood on Guthrie's front porch was a match to her, Nanos has said.

The sheriff said Thursday that investigators have not given up on trying to retrieve footage from the home.

"I wish technology was as easy as we believe it is, that here's a picture, here's your bad guy. But it's not," Nanos told the AP. "There are pieces of information that come to us from these tech groups that say 'this is what we have and we can't get anymore.'"

Concern about Nancy Guthrie's condition is growing because authorities say she needs daily medicine that's vital to her health. She was said to have a pacemaker and dealt with high blood pressure and heart issues, according to sheriff's dispatcher audio on... Read More