Masked Person Came to Guthrie's Doorstep Before Disappearance, Videos Show

New images and videos released on Tuesday showed a masked, armed person at Nancy Guthrie's doorstep on the night she was abducted, the first significant break in the search for the 84-year-old mother of the "Today" show host Savannah Guthrie.

The black-and-white footage released by the F.B.I. and Pima County Sheriff's Department depicts a person wearing a ski mask, gloves, a backpack and what appears to be a holstered handgun outside of Ms. Guthrie's home, just north of Tucson. Investigators said the person was armed.