Authorities are widening their search for Savannah Guthrie's mom, Nancy Guthrie, after revealing law enforcement is investigating new leads. "Many of you observed an active presence at the Guthrie residences over the weekend. That activity will continue tonight and into tomorrow as part of the ongoing investigative process, including the expansion of the search and follow-up on new leads," the Pima County Sheriff's Department announced via social media on Monday, February 9. . "This is all part of the investigative process, as the search for Nancy expands and new leads come in.