«Local media reported that the Tibet Tourism Bureau issued a circular to the industry at the end of 2018 warning that no foreign tourists would be allowed to apply for a permit to enter the Himalayan region from Jan. 30 to April 1.
Tour operators reminded travelers to postpone their plans and stressed that it has become a normal practice to seal Tibet off from prying foreign eyes every spring since 2008, when China hosted the Summer Olympics.»

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China extends ban on foreigners in Tibet as uprising feted – ucanews.com

Communist Party also bars diplomats in restive province, highlighting lack of support for its rule