Nancy Guthrie, the mother of television star Savannah Guthrie, was reported missing from her home in Arizona on February 1.
In video footage released by the FBI, a masked and armed person was seen outside Nancy Guthrie's door in connection with her disappearance.
One person has been taken in for questioning, and police are preparing to search a property connected to that individual, ABC News and others report.
Savannah Guthrie writes on social media that she believes her mother is still alive and is appealing to the public for help.
