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Significant developments in the Nancy Guthrie case. Investigators have been going door-to-door in the neighborhood where Savannah Guthrie's sister Annie lives, which is about four miles away from her mom's home. A backyard neighbor telling CNN that law enforcement came by today asking to look around his property. All of this capping a day that began with perhaps the biggest break so far; video retrieved from Nancy Guthrie's Nest doorbell camera from the morning she was taken. 

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