The Muslim husband and wife behind the mass shooting in San Bernardino began erasing their digital footprint a day in advance of the deadly attack, deleting email accounts, disposing of hard drives and smashing their cellphones, according to law enforcement investigators who are treating the probe as a counterterrorism case.
Intelligence sources said there is still no explicit evidence linking the two to known terrorists on U.S. or foreign watch lists and that the couple was not on the FBI's radar before Wednesday's deadly shooting rampage.
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