A person of interest was recently detained in connection with Guthrie's Feb. 1 disappearance, but released within 24 hours.

The investigation into Nancy Guthrie's disappearance continues with investigators asking people in her neighborhood to check their security footage.

The FBI has released surveillance photos of a potential subject in the investigation into the disappearance of “TODAY” co-anchor Savannah Guthrie’s mother. NBC News' Tom Winter reports on the new details.

Guthrie, 84, is the mother of “Today” host Savannah Guthrie. She was last seen outside her home on Jan. 31. Officials suspect foul play, and both the FBI and Guthrie’s family have released multiple pleas to anyone who may have taken her.

Authorities say they have received more than 4,000 tips since the release of doorbell camera footage showing "an armed individual" outside her home on the morning of her disappearance.

More than a week after Today's Savannah Guthrie and her siblings reported mom Nancy Guthrie missing, police are investigating all angles while the journalist issues public pleas for her safe return.

Nancy Guthrie's disappearance has garnered a lot of attention from online sleuths, these are the most popular theories about her abduction.