Police say a man held his disabled wife captive for five years inside the $1 million home they shared with their children.
The FBI and the Pima County Sheriff's Department area "aware of a new message regarding Nancy Guthrie," the sheriff's office said Friday.
The man allegedly used an app to create a fake phone number to text the family, according to a federal complaint.
Nancy Guthrie is believed to have been abducted in her sleep from her Arizona home early Sunday, authorities said. No suspect or person of interest has been identified in the case.
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.