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On Saturday night, Lady Gaga introduced himself as her biggest audience so far, two million people on the beach Copacabana in Rio de Janeiro.
In the evening, however, he could end up with a disaster for the huge crowds in Brazil.
Police said they thwarted a bomb attack, which was planned to be held at the concert.
The BBC Mimi Swaby explains how the scheme was captured and for whom the police are behind it.
A video produced by Rachel Flynn and Ian Casey.