Masked gunman outside Nancy Guthrie’s home in images released by FBI

Authorities investigating the disappearance of Nancy Guthrie released the first surveillance images Tuesday showing a masked person with what looked like a handgun holster on her porch the night she went missing more than a week ago.

Video released by the FBI shows the person wearing a backpack, long sleeves and pants walking up to the door at the home of the mother of “Today” show host Savannah Guthrie. The footage shows the person trying to cover a doorbell camera near the front door...