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Facebook, Google and Twitter have been accused in a new lawsuit of aiding terrorism. The suit was filed by family members of three of the victims in the 2015 San Bernardino terrorist attack.
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The brother of gunman Syed Rizwan Farook was among those taken into custody over what federal prosecutors say was a conspiracy involving a "sham marriage."
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A federal law enforcement official told NPR that Tashfeen Malik, a suspect along with her husband in Wednesday's mass shooting, had pledged allegiance to the Islamic State and its leader on Facebook.