"This case continues to be investigated as a kidnapping for ransom case," the FBI said in a statement.
The "Today" show host and her siblings made an emotional plea for the return of their mother, who remains missing in Arizona.
Investigations are continuing after the mother of "Today" show host Savannah Guthrie disappeared over the weekend in what authorities believe was a possible abduction.
The Oakland Unified School District said two more families received calls this week that their child was kidnapped and being held for ransom.
The FBI has seized a website that a notorious ransomware gang, which has extorted more than $100 million from victim organizations, has used to shame its victims, according to a posting on the website.
Police say "Felon" the American Bulldog was taken by a man earlier this month, who his owner only knew through mutual friends.
