Investigators believe the missing mother of “Today” show host Savannah Guthrie is “still out there,” but they have not identified any suspects, a sheriff in Arizona said Thursday.

Pima County Sheriff Chris Nanos also said DNA tests showed blood found on Nancy Guthrie ’s porch came back a match to her.

The FBI has offered a $50,000 reward for information that leads to Nancy Guthrie being recoered and/or the arrest, conviction of anyone involved in her disappearance.

“Right now, we believe Nancy is still out there. We want her home,” Nanos said at a news conference five days after she was reported missing.

There was no public sign early Thursday of a response to NBC “Today” show host Savannah Guthrie’s message to her 84-year-old mother’s kidnapper.

Guthrie said her family is ready to talk but wants proof that Nancy Guthrie, who authorities believe was taken from her home in Arizona against her will, is still alive. Guthrie said in a heart-wrenching video posted on social media Wednesday that her family has heard media reports about a ransom letter.

“We are ready to talk. However, we live in a world where voices and images are easily manipulated,” Savannah Guthrie said while reading from a prepared statement. “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 was last seen Saturday night when she was dropped off at her Tucson home by family after having dinner with them, the sheriff’s department said. She was reported missing about 14 hours later on Sunday after she didn’t show up at a church.

Guthrie has limited mobility, and officials don’t believe she left on her own. 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.

The neighborhood’s desert terrain can make looking for people difficult, said Jim Mason, longtime commander of a search-and-rescue team in Maricopa County that isn’t involved in the search. He said it can be hard to see into areas dense with mesquite trees, cholla cactus and desert brush.

“Some of it is so thick you can’t drive through it,” Mason said.

Purported ransom notes

At least three media organizations have reported receiving purported ransom notes that they handed over to investigators. The sheriff’s department has said it was taking the notes and other tips seriously but declined to comment further.

A note emailed Monday to the KOLD-TV newsroom in Tucson included information that only the abductor would know, anchor Mary Coleman told CNN. It also included a dollar amount and a deadline, she said.

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

The family posted their plea after police searched in and around Nancy Guthrie’s home for several hours Wednesday.

Investigators returned for the follow-up investigation after being at the home earlier in the week for a couple of days, said Kevin Adger, a spokesperson for the Pima County Sheriff’s Department. He said the sheriff’s department was not commenting on the family's video message.

The Guthrie siblings' message to their mother

Savannah Guthrie was emotional during the recording, with her voice cracking. She addressed her mother directly, saying the family was praying for her and that people were looking for her.

“Mommy, if you are hearing this, you are a strong woman. You are God’s precious daughter,” she said.

Savannah Guthrie described her mother as a “kind, faithful, loyal, fiercely loving woman of goodness and light” and said she was funny, spunky and clever.

“Talk to her and you’ll see,” she said.

Guthrie was flanked by her sister Annie and her brother Camron.

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

Nation prays for Nancy Guthrie

President Donald Trump posted on social media that he was directing federal authorities to help where they can, after the White House said he spoke with Savannah Guthrie on Wednesday.

A couple hundred people prayed and placed lit candles on an altar during a vigil at a Tucson church.

Jeremy Thacker had tears in his eyes as he described the heartbreak and helplessness. He worked with Savannah Guthrie at an Arizona news station. They shared losing their fathers at a young age, and his own sister was kidnapped when he was young.

Thacker said he knew Nancy Guthrie to be sharp, grounded and earnest.

“We’re all holding our breath,” Thacker said.