Chinese state television said the violent knife attack in a train station in Kunming, China, was the result of "violent terror attack."
Pictures being shared on social media show bodies covered in blood lying around the ground at the station.
There has been no immediate word on who is responsible. State television said Communist Party Officials were on their way to the scene.
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Satoshi Uematsu, 26, was sent to the Yokohama District Public Prosecutors Office in Kanagawa prefecture.
West Yorkshire Police confirmed a 32-year-old woman was taken into custody in connection with the alleged threats.