By Jack Phillips

Police are monitoring the Arizona home of “Today” show co-host Savannah Guthrie’s mother, Nancy, the Pima County Sheriff’s Department (PCSD) said in a Sunday evening statement.

“At the request of the Guthrie family, PCSD will maintain a presence at Nancy Guthrie’s residence for security,” the statement said. “Media & the public are reminded to follow all traffic & private property laws.”

Nancy Guthrie, 84, went missing from her home in late January. Officials said they are investigating ransom notes that were sent in connection with her disappearance. They’ve also described her Tucson-area home as a crime scene and indicated that she was taken against her will.

The department’s statement added that “no trespassing is allowed on the Guthrie property” and “violations are subject to enforcement.” No other details were provided.

In a news conference on Feb. 5, Pima County Sheriff Chris Nanos and the FBI provided an update on their investigation, and an FBI official announced a $50,000 reward for information leading to an arrest in the case. No suspects or persons of interest have been identified.

The ransom notes cited deadlines of 5 p.m. local time on Feb. 5 and another for Feb. 9, said FBI Special Agent in Charge Heith Janke during the press conference, the latest held on the case. He did not say whether there was a time listed with the Monday deadline, adding that the family’s decision whether to pay the ransom is up to them.

DNA tests showed that blood found on Guthrie’s front porch was a match to her, Nanos said this past week. He also disclosed a day later, in an interview on Feb. 6, that he believes she is still alive, although he didn’t provide further details.

Over the past weekend, Savannah Guthrie released a social media video appeal. Sitting alongside her siblings, Guthrie said, “We received your message, and we understand. 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.”

The video released on Saturday was the third this week that pleaded with potential abductors. The “Today” show anchor’s 20-second video did not provide details about the message the family referenced.

Her brother, Camron Guthrie, posted a similar video on social media on Feb. 5 that also pleaded with possible kidnappers.

“This is Camron Guthrie. I’m speaking for the Guthrie family. Whoever is out there holding our mother, we want to hear from you,” he said. “We haven’t heard anything directly. We need you to reach out, and we need a way to communicate with you so we can move forward.”

The White House said President Donald Trump called and spoke with Savannah Guthrie this past week. The president told reporters on Feb. 6 that there are clues in the case “that I think are very strong.”

Authorities say they have concerns about Nancy Guthrie’s health because she needs daily medication and has a pacemaker, which was disconnected from a monitoring device.

The Associated Press contributed to this report.