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.
China dismantled CIA spying in the country starting in 2010, unraveling a network that took decades to build https://t.co/WqrxlFpwQu— The New York Times (@nytimes) 20 May 2017