TUCSON, Ariz. (AP) — The urgent investigation into the apparent kidnapping of 84-year-old Nancy Guthrie continued Sunday, a week after the mother of 'Today' show host Savannah Guthrie was reported missing in Arizona.

Savannah Guthrie had released a solemn video on social media, pleading with potential kidnappers, stating that the family was prepared to pay for her mother's safe return. Flanked by her siblings, she insisted, We received your message... This is very valuable to us, and we will pay.

According to an FBI spokesman, Savannah was referencing a message sent to Tucson-based television station KOLD. The contents of the message have not been disclosed as the investigation is ongoing.

Authorities believe Nancy Guthrie was taken against her will from her home just outside Tucson last weekend. Blood on her front porch has been confirmed as a match to Nancy's DNA, according to Pima County Sheriff Chris Nanos.

This past week, several press outlets received alleged ransom letters, with demands purportedly made, establishing deadlines for the family. While officials have not confirmed the letters' authenticity, they are being taken very seriously and pursued.

As public interest grows, social media activity surrounding the case has escalated, with amateur sleuths contributing to the widespread search efforts. The sheriffs have not provided recent updates.

In a developing situation, authorities have expressed growing concern for Nancy's health, as she has daily medication needs and a pacemaker due to pre-existing health issues.

On Saturday, the White House revealed that President Donald Trump spoke with Savannah, mentioning that there are strong clues in the case. As lighting remains lit outside Nancy's home, thousands across the nation are keeping hope alive for her safe return.