Doorbell video released by the FBI shows the moment an armed individual wearing a balaclava approaches Nancy Guthrie's house on the night she disappeared. The 84-year-old mother of U.S. television anchor Savannah Guthrie went missing more than a week ago. Sky's Martha Kelner reports on a "stunning development" in the case. #skynews #usnews SUBSCRIBE to our YouTube channel for more videos: http://www.youtube.com/skynews Follow us on Twitter: https://twitter.com/skynews Like us on Facebook: https:

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