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China killed or imprisoned up to 20 CIA sources between 2010 and 2012, the New York Times has reported.
Whether the US intelligence agency was hacked or whether a spy helped to identify the individuals is unclear.
At least a dozen people providing information to the CIA were killed by the Chinese, according to the newspaper report – dismantling a network that was years in the making.
Officials told the paper that one source was shot in front of a government building in China, saying the aim was to send out a warning to others about working with Washington.
The CIA has declined to comment on the report.
The New York Times on Twitter
China dismantled CIA spying in the country starting in 2010, unraveling a network that took decades to build https://t.co/WqrxlFpwQu