The U.S. government and Microsoft formally accused "China's state-backed hacking teams" of being responsible for stealing EU and U.S. government officials' emails in an operation that began in May, CPO Magazine reports. The Microsoft threat research team claimed Chinese hackers breached more than two dozen entities, including the U.S. State Department and Department of Commerce. Microsoft officials said the hackers used forged authentication tokens that granted "broad access" but they were used "strategically to target a few specific high-level government email accounts at each agency."