A variety of concerns over the Games, or China's hosting of the Games, had been expressed by various entities, including claims that China violated its pledge to allow open media access, various claims of human rights violations, its alleged continuous support of repressive regimes (such as Zimbabwe, Myanmar, Sudan, and North Korea), air pollution in both the city of Beijing and environs, proposed boycotts, warnings of the possibility that the Beijing Olympics could be targeted by terrorist groups, disruption from Tibetan separatist protesters, and religious persecutions.