Search for Nancy Guthrie Enters Day 10 as Ransom Deadline Passes With No Contact

The search for Nancy Guthrie, 84, has now stretched to 10 days with no confirmed developments from those who may have taken her. Her daughter, Savannah Guthrie, released a new video late Monday asking the public for help locating her mother.

According to a source close to the family who spoke to NBC News, Nancy and her friends regularly gathered to watch church services together online. When Nancy didn't arrive at a friend's house that Sunday morning, the friend called her daughter Annie, prompting the family to discover she was missing.

The FBI has since put up digital missing persons billboards, donated by Clear Channel, in dozens of cities across the region. But a deadline set in an alleged ransom demand has now come and gone. The FBI says it is "not aware of any continued communication between the Guthrie family and suspected kidnappers."

The ransom note, sent to three news outlets last week, demanded $6 million in Bitcoin. Law enforcement has not verified its authenticity. Former FBI hostage negotiator Jim Cavanaugh, who reviewed the note, said certain aspects made him question whether it was legitimate. "They don't even prove they're the actual abductors," Cavanaugh said. "So they could come from anywhere in the world."

On Saturday, Savannah posted another video saying she and her siblings Annie and Camron were willing to pay for their mother's safe return. "We beg you now to return our mother to us so that we can celebrate with her," she said. "This is the only way we will have peace."

Authorities are continuing the search and asking the public for help. "Don't give up the ship," Cavanaugh said. "There's no proof of life, but there's no proof of death either."