Brazilian police said that they had thwarted a bomb attack planned for Lady Gaga’s historic concert that drew over 2 million people to Copacabana Beach in Rio de Janeiro on Saturday.

Photos of the performance were released to the media on Monday.

The Civil Police of Rio de Janeiro state, working in coordination with the Justice Ministry, said the plot was orchestrated by a group promoting hate speech and the radicalisation of teenagers, including self-harm and violent content as a form of social belonging.

According to the Rio city hall, 2.1 million people attended the concert of the American pop icon.

The operation was based on a report by the ministry’s Cyber Operations Lab following a tip-off from Rio state police intelligence, which uncovered digital cells encouraging violent behaviour among teenagers using coded language and extremist symbolism.

A man described as the group’s leader was arrested in the southern state of Rio Grande do Sul for illegal possession of a firearm, while a teenager in Rio de Janeiro was detained for storing child pornography.