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Current and former American officials
according to former American officials
According to three of the officials
according to two former senior American officials
Details about the investigation have been tightly held. Ten current and former American officials described the investigation on the condition of anonymity because they did not want to be identified discussing the information
The Chinese government systematically dismantled C.I.A. spying operations in the country starting in 2010, killing or imprisoning more than a dozen sources over two years and crippling intelligence gathering there for years afterward.
Current and former American officials described the intelligence breach as one of the worst in decades. It set off a scramble in Washington’s intelligence and law enforcement agencies to contain the fallout, but investigators were bitterly divided over the cause. Some were convinced that a mole within the C.I.A. had betrayed the United States. Others believed that the Chinese had hacked the covert system the C.I.A. used to communicate with its foreign sources. Years later, that debate remains unresolved.