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Beijing subway will use facial recognition technology to classify passengers to help guards take different security check measures, according to a top official of the city's rail traffic control.

Beijing Daxing International Airport completed its largest official comprehensive test on Friday, marking steady progress toward the start of commercial operations by the end of September.

Beijing expressed "grave concerns" over Washington sending officials to the opening ceremony of a new office of the American Institute in Taiwan on Tuesday, and urged Washington to keep its promises over the Taiwan question.

Because of this, the private sector's confidence may have been lowered, he said.

Before their departure from Japan, a grand send-off ceremony was held at Adventure World, and around 1,200 Japanese fans said goodbye.