New surveillance video of a masked and apparently armed person on Nancy Guthrie’s doorstep the night she went missing was released Tuesday by federal investigators. It’s the first major break in the intensifying search for the 84-year-old mother of “Today” show host Savannah Guthrie. Authorities have not identified any suspects or persons of interest and […]... Keep on reading: US TV anchor’s mother: Here’s what happened each day of her disappearance