It is the largest coordinated effort following several months of similar calls from individual rights groups, and comes as Beijing is facing increased international backlash over policies including its treatment of ethnic Uighurs in Xinjiang and new security laws in Hong Kong.
Among the letter's signatories are Uighur, Tibetan, Hong Kong and Mongolian rights groups based in Asia, Europe, North America, Africa and Australia. There was similar outcry from rights groups ahead of the 2008 Beijing Olympics. At the time, the IOC defended the choice, saying the Games were a force for good.
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