UPDATE: FBI combs through desert in search for clues in Nancy Guthrie’s disappearance

TUCSON, Ariz. (AP) — FBI agents are fanning out across an Arizona neighborhood not far from Nancy Guthrie’s home. They’re knocking on doors and searching through thick desert terrain.

This comes a day after authorities investigating Guthrie’s disappearance detained a man who says he was questioned for hours before being released.

The man told several media outlets on Wednesday that he had nothing to do with last week’s disappearance of Guthrie, the 84-year-old mother of “Today” show host Savannah Guthrie.

Hours earlier, the FBI released images of a masked person on Nancy Guthrie’s porch the night she went missing near Tucson.