The attack was an eerie throwback to deadly attacks at schools in China over past years that prompted security upgrades and that authorities have blamed largely on people bearing grudges or who had unidentified mental illnesses.
China, which will host the tournament for the second time after 2004, had been one of four nations to initially bid to host the 24-team competition with South Korea, Indonesia, and Thailand also submitting bids before pulling out.
China's facial recognition measures increasingly extend not only to shops and public spaces but also homes and now mobile phones.
Police say a knife-wielding woman attacked and wounded over a dozen children at the gate of a kindergarten in China's southwestern city of Chongqing, without giving possible motives for the attack.
"Every one of us in the party resolutely opposes all actions that undermine, distort or negate leadership" Chinese President Xi Jinping told the Communist Party congress. He also referred to the strained relations with Taiwan.
The top-secret 816 nuclear plant is built into the world's largest artificial cave buried in the Chongqing mountains and opened for tourism in 2010.
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