TUCSON, Ariz. — On Thursday, Savannah Guthrie’s brother made a renewed appeal for contact from their mother’s captor, following a statement from an Arizona sheriff. The sheriff indicated that while there’s no evidence confirming Nancy Guthrie’s current condition, they believe she remains alive.

“To whoever is holding our mother, we need to hear from you. We haven’t received any direct communication,” Camron Guthrie expressed in a video shared online.

“We need you to make contact so we can find a way forward,” he continued, stressing the importance of establishing communication with the captor. His words echoed those of his sister, a well-known television host, who made a similar plea just the previous day.

As the search for the 84-year-old Nancy Guthrie enters its fifth day, Pima County Sheriff Chris Nanos reported that investigators have yet to identify any suspects or persons of interest.

Authorities suspect Nancy was forcibly taken from her Tucson residence over the weekend. Blood found on her front porch, confirmed through DNA testing, matches hers, according to the sheriff.

“Right now, we believe Nancy is still out there. We want her home,” Nanos said at a news conference earlier Thursday. He acknowledged, however, that authorities have no evidence she’s OK.

Investigators said they are taking seriously notes seeking ransom that were sent to some media outlets.

It’s unclear if all of the notes were identical. Heith Janke, the FBI chief in Phoenix, said details included a demand for money with a Thursday evening deadline and a second deadline for Monday if the first one wasn’t met. At least one note mentioned a floodlight at Guthrie’s home and an Apple watch, Janke said.

“To anyone who may be involved, do the right thing. This is an 84-year-old grandma,” Janke said.

At least three media organizations reported receiving purported ransom notes, which they handed over to investigators. Authorities made an arrest after one ransom note turned out to be fake, the sheriff said.

A note e-mailed Monday to the KOLD-TV newsroom in Tucson included information that only the abductor would know, anchor Mary Coleman told CNN.

“When we saw some of those details, it was clear after a couple of sentences that this might not be a hoax,” she said.

The sheriff said it’s possible Nancy Guthrie was targeted, but if she was, investigators don’t know if that’s because her daughter is one of television’s most visible anchors.

Authorities say any decision on whether to fulfill ransom demands ultimately is up to the family.

A day earlier, Savannah Guthrie and her siblings released a message to her mother’s kidnapper, saying they are ready to talk but want proof their mom is still alive. There’s been no response to their pleas so far.

Investigators gave a more detailed timeline from the hours after Nancy Guthrie was last seen Saturday night. She was eating dinner and playing games with family members before one of them dropped her off at her home in a upscale neighborhood that sits on hilly, desert terrain, the sheriff said.

About four hours later, just before 2 a.m. Sunday, the home’s doorbell camera was disconnected, Nanos said. But Guthrie did not have an active subscription, so the doorbell company was unable to recover any footage.

Software data recorded movement at the home minutes later, the sheriff said, acknowledging that the motion could have come from an animal.

Then at 2:28 a.m. the app on Guthrie’s pacemaker was disconnected from her phone.

Guthrie was reported missing shortly before noon Sunday after she didn’t show up at a church.

While she is able to drive and her mind is sharp, the sheriff said she has difficulty walking even short distances. She also requires daily medicine that’s vital to her health, he has said.

A sheriff’s dispatcher said during the search Sunday that Guthrie has high blood pressure, a pacemaker and heart issues, according to audio from broadcastify.com.

Investigators searched in and around Guthrie’s home again for several hours Wednesday.

Authorities are bringing more resources and people into the investigation, and the FBI announced Thursday it was offering up to $50,000 for information. A day earlier, President Donald Trump posted on social media that he was directing federal authorities to help where they can.

The kidnapping has attracted the attention of the American public, much like other famous abductions in U.S. history.

Savannah Guthrie has hosted “Today” — NBC’s flagship morning show — for more than a decade and had been set to co-anchor the network’s coverage of Friday’s opening ceremony for the Winter Olympics. For now, she’s staying close to her mother’s home.

She joined her two siblings in an emotional plea on social media Wednesday to say they’re ready to talk to whoever sent the ransom notes.

“We need to know without a doubt that she is alive and that you have her. We want to hear from you and we are ready to listen. Please reach out to us,” she said while fighting off tears.

With her voice cracking, she addressed her mother directly, saying the family was praying for her and that people were looking for her. She was flanked by Camron and their sister, Annie.

“Mamma, If you’re listening, we need you to come home. We miss you,” Annie Guthrie said.

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