More than a week has gone by since "Today" anchor Savannah Guthrie's mother was last seen, and the family is pleading to her kidnapper that they "will pay" for her return.

The search for Nancy Guthrie remains underway in Arizona, where authorities have said the 84-year-old was taken from her home near Tucson. The Pima County Sheriff's Department is investigating Guthrie's disappearance alongside the FBI, which is offering a $50,000 reward for information leading to her recovery.

Guthrie takes daily medication, and it could prove fatal if she does not receive it, according to law enforcement. Anyone with information is asked to contact the FBI at 800-CALL-FBI.

On Feb. 7, the Sheriff's Department said detectives and agents are continuing to conduct follow-ups at Guthrie's residence and the surrounding areas, and law enforcement was seen at the home of Nancy's daughter Annie Guthrie on Saturday, Feb. 7, according to CNN. The Sheriff's Department previously said on Feb. 6 that investigators are also "aware of a new message regarding Nancy Guthrie" and are inspecting its authenticity.

President Donald Trump told reporters on Feb. 6 that "we have some clues, I think, that are very strong" in the case, adding, "We could have some answers coming up fairly soon."