This July 27, 2014, photo provided by U.S. Customs and Border Protection shows Tashfeen Malik, left, and her husband, Syed Farook, as they passed through O'Hare International Airport in Chicago. The attack in San Bernardino, California, that left 14 people dead represented a type of extremist plot law enforcement authorities consider exceedingly difficult to detect: a conspiracy between close family members. (U.S. Customs and Border Protection via AP, File)
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