TUCSON, Ariz. – The search for Nancy Guthrie, mother of NBC's Today host Savannah Guthrie, is intensifying as investigators are still without a suspect four days after her mysterious disappearance. Authorities reported signs of forced entry at her Tucson residence, leading to fears that she may have been taken against her will over the weekend.

The Pima County Sheriff Chris Nanos revealed that Nancy, who has limited mobility and relies on daily medication, is believed to not have left her home voluntarily. We hope she’s still alive, Nanos stated during a recent news conference, urging the public to come forward with any tips.

Family members reported Nancy missing on Sunday after failing to locate her at church, prompting them to check her home before calling 911. Investigators found personal belongings including her cellphone, wallet, and car still at the residence, indicating a possible kidnapping.

Media outlets have also received purported ransom notes, which are being taken seriously by law enforcement, although details about them remain undisclosed. They are currently analyzing DNA samples collected as part of the investigation, but no leads regarding a suspect have emerged yet.

We are reviewing surveillance footage from nearby homes and gathering data from local license plate cameras and cellphone towers to aid in the investigation, a source close to the investigation revealed.

The case remains a priority for the authorities given Nancy's health condition, and the public is encouraged to provide any information that may assist in the search. As the case continues to unfold, Savannah Guthrie has stepped back from her duties at NBC, focusing on her family during this challenging time.

For the latest updates, stay tuned to PulseWire news as we continue to cover this developing story.