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FBI looking for terror connection in San Bernardino shooting

04:09

There is growing evidence that the couple behind the rampage in San Bernardino had become radicalized, having been in communication with jihadist sympathizers leading up to the shooting. Farhan Khan, the brother-in-law of Syed Rizwan Farook, says he saw no signs that Farook had become radical. NBC national correspondent Craig Melvin reports for TODAY.