India, Feb. 4 -- Arizona authorities are urgently searching for 84-year-old Nancy Guthrie, the mother of NBC "Today" show co-anchor Savannah Guthrie, after she was reported missing from her home near Tucson over the weekend. Officials have now declared her residence a crime scene, saying they believe she was taken against her will.

Nancy was last seen Saturday night at her home in the Catalina Foothills area. When she failed to appear at a Sunday church service and could not be reached by family, loved ones reported her missing around noon. Authorities immediately launched a wide-ranging search that has since shifted into a criminal investigation.

Sheriff Chris Nanos of the Pima County Sheriff's Department said investigators treat the d...