Brazilian police have thwarted a bomb attack planned for Lady Gaga’s concert on Copacabana beach in Rio de Janeiro on Saturday. The Civil Police of Rio de Janeiro state, in coordination with the justice ministry, said suspects had recruited participants to carry out attacks using improvised explosives and the plan was aimed at gaining notoriety on social media.

The person responsible for the plan and a teenager were arrested, with the police saying the group had been spreading hate speech, mainly against children, adolescents, and the LGBTQ+ community. The alleged mastermind was arrested for illegal possession of a firearm, while the teenager was detained for storing child pornography.

The suspects had identified themselves as Lady Gaga fans, known as “Little Monsters.” Police issued search warrants across four states, seizing electronic devices and other materials. The concert, which was paid for by the city, attracted a crowd of over two million people and was part of an effort to revitalize Rio’s economy.

Lady Gaga, who last performed in Brazil in 2012, took the stage as part of a tour to promote her eighth album, Mayhem. She wore Brazil-themed costumes and told the crowd, “You waited for more than 10 years for me,” holding out a Brazilian flag. The event was heavily policed, with 5,000 officers deployed and attendees passing through metal detectors. Drones and facial recognition cameras were also used to police the event.