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epa09397042 Airport workers and travelers ride on a moving staircase at terminal 3 of Beijing Capital International Airport, amid the coronavirus pandemic in Beijing, China, 05 August 2021. The coronavirus outbreak, caused mainly by the Delta variant, was first detected on 20 July in Nanjing, Jiangsu province, and has already infected more than 400 people and spread over two dozen cities including Wuhan, where the coronavirus first emerged, and the capital Beijing. Since the Delta outbreak began spreading across China, authorities have imposed mass domestic travel restrictions, as well as international travel restrictions for its residents, allowing Chinese people to leave the country only under certain conditions. EPA/ROMAN PILIPEY