ABC News affiliate, 23ABC News, are reporting that the shooter in Taft high school has been apprehended by police.
The station reported that students called the station from inside the school, whilst they were hiding.
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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.