Former Yahoo Chief Executive Marissa Mayer apologised on Wednesday for two massive data breaches at the internet company, blaming Russian agents for at least one of them, at a hearing on the growing number of cyber attacks on major U.S. companies. "As CEO, these thefts occurred during my tenure, and I want to sincerely apologise to each and every one of our users, she told the Senate Commerce Committee, testifying alongside the interim and former CEOs of Equifax Inc (EFX.N) and a senior Verizon Communications Inc (VZ.N) executive.

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