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Yahoo Inc knew it had been a target to sophisticated Chinese cyber attacks on U.S. corporations before Google alerted the company to them, a source familiar with the matter said, but chose to remain silent after its bigger rival went public.
Google got in touch with Yahoo "to share knowledge" -- after determining through its own investigations that Yahoo had also fallen victim to cyber attacks -- and Yahoo then confirmed to Google it "was already aware of similar issues on their side," the person said on condition of anonymity.
