The FBI said Thursday that it is offering a reward of up to $50,000 for information leading to the recovery of NBC's "Today" show co-host Savannah Guthrie's mother, Nancy Guthrie, and/or the arrest and conviction of anyone involved in her disappearance.

Nancy Guthrie, 84, was last seen Saturday night in her home outside Tucson, Ariz., and her family reported her missing around noon Sunday, after a member of her church notified them the following morning that she didn’t show up for Sunday service as she regularly does.

Pima County Sheriff Chris Nanos said on Monday that authorities believe Nancy Guthrie was removed from her house against her will in a “possible kidnapping or abduction.”

Savannah and her siblings shared a video Wednesday evening stating that they are “ready to talk” to whomever abducted her – but only when they know for certain that their mother is alive.

“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.”