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On Saturday evening, Lady Gaga performed for her largest audience ever, two million people on Copacabana Beach in Rio de Janeiro.
However, the evening could have ended a disaster for the huge crowd in Brazil.
The police said they thwarted a bomb attack that was planned to take place during the concert.
The Mimi Swaby of the BBC explains how the scheme was intercepted and who the police say that was behind it.
Video produced by Rachel Flynn and Ian Casey.
