TUCSON, Arizona: 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.

Law enforcement officials in Arizona said Wednesday they have not identified a suspect as they enter the fourth day searching for Nancy Guthrie.

The 84 year-old mother of Savannah Guthrie, the popular co-host of the NBC news show Today, was last seen at her Arizona home on Saturday night.