Reports say Chinese government censors have tried since the first release of leaked documents on Sunday to keep the media in China from mentioning the names of these individuals.
They have gone as far as to block internet searches of the words Panama Papers, further reports have revealed.
But they are considered especially sensitive in China, where the Communist Party, under Mr. Xi, has pledged to eradicate corruption within its ranks and seeks to portray itself as a champion of equality, despite some of the world’s most glaring income disparities.
President Xi is the third member of the Politburo committee cited in the report as having a relative who controlled offshore companies. The ties of Mr. Xi’s brother-in-law, Deng Jiagui, to offshore companies have been known since 2012, when a Bloomberg News article about Mr. Xi’s family wealth detailed the business empire of Mr. Deng and his wife, Qi Qiaoqiao, the president’s sister.