A police officer at the Trafalgar Square Thatcher protests has been captured on camera telling members of the public that the crowd had been infiltrated by Millwall football fans.
The officer goes on to say that the fans had been causing fights and were throwing bottles - earlier reported to be filled with urine.
Moments later, people are seen throwing bottles at the police and the crowd.
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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.