British Prime Minister Boris Johnson returns to 10 Downing Street after his statement in London, Britain, on Thursday. Boris Johnson resigned as British prime minister and the leader of the Conservative Party in a statement to the country on Thursday. (Photo: Xinhua)

A man shows an extra edition of the Yomiuri Shimbun newspaper reporting on the shooting of former Japanese Prime Minister Shinzo Abe, on a street in Tokyo, Japan, on Friday. (Photo: Xinhua)

Astrid Cardona kisses her mother Ufemia Tomas, the mother of survivor Yenifer Yulisa Cardona Tomas, during an interview in Guatemala City, on Monday. Yenifer is one of the survivors of the more than 50 migrants who were found dead inside a tractor-trailer near San Antonio, Texas. (Photo: AP)

Tourists skate at the National Speed Skating Oval in Beijing, capital of China, on Saturday. The National Speed Skating Oval, also known as the "Ice Ribbon," opened to the public on Saturday. (Photo: Xinhua)

Photo taken on Tuesday shows the view of a commercial street in Wuhan, Central China's Hubei Province. In recent years, Hubei Province has striven to combine its night economy with culture and tourism in innovative ways, thus enhancing the vitality and attraction of nighttime consumption. (Photo: Xinhua)

A visitor views an exhibition themed "WAVELENGTH: On the Edge of Senses" at the Times Art Museum in Beijing, capital of China, on Wednesday. (Photo: Xinhua)

Birds take flight as a couple poses during a photo session on the Galata bridge as the sun sets in Istanbul, Turkey, on Thursday. (Photo: AP)

Tourists watch as sediment-laden water gushes out from the Xiaolangdi Reservoir on the Yellow River during a water-sediment regulating operation in Jiyuan, Central China's Henan Province, on Monday. (Photo: Xinhua)

Photo taken on on Tuesday shows sand tiger sharks in the Scientific Center aquarium, in Hawalli Governorate, Kuwait. The Scientific Center of Kuwait (TSCK) announced on Tuesday its success with breeding the critically endangered sand tiger sharks, making it a leader in global efforts to save the species from extinction. (Photo: Xinhua)

Photo taken on Wednesday shows lotus flowers at Daguan Park in Kunming, Southwest China's Yunnan Province. (Photo: Xinhua)