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How investigators are canvassing Tucson area in Nancy Guthrie search

Authorities were still racing to find answers in the search for 84-year-old Nancy Guthrie on Wednesday. The FBI said numerous agents are searching roadways in the Catalina Foothills area just north of Tucson, Arizona, the same neighborhood as Guthrie's home. CBS News reporter Andres Gutierrez has more.
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