(NEWSER) – San Bernardino shooter Tashfeen Malik tried to join Islamic extremist groups in the months before the massacre only to get the cold shoulder, according to law enforcement sources.

Those sources tell Reuters that the groups appear to have ignored Malik because she was completely unknown to them and they feared her approaches were part of a sting operation. The Syrian al-Qaeda affiliate Nusra Front was probably among the groups she tried to contact, though investigators have yet to find a strong link to ISIS, the sources say. Investigators searched a lake in San Bernardino Thursday for electronic evidence, including a missing hard drive, according to the Los Angeles Times' sources.

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