Brazilian police have arrested two individuals in connection with a foiled bomb plot aimed at targeting Lady Gaga's major concert in Copacabana, Rio de Janeiro.

The concert, a free event held over the weekend, attracted up to two million attendees and marked Lady Gaga's first performance in Brazil since 2012.

Authorities reported that the successful operation, carried out by Rio's civil police in collaboration with the ministry of justice, prevented a potential bomb attack during the high-profile event.

In a statement, police confirmed they arrested an adult identified as responsible for orchestrating the plot, along with a minor.

The operation, codenamed 'Fake Monster'—a reference to Lady Gaga's fans, known as 'Little Monsters'—involved online recruitment for attacks utilizing improvised explosives and Molotov cocktails, described as a 'collective challenge' aimed at gaining social media notoriety.

The police investigation revealed a group promoting hate speech and engaging in the radicalization of young individuals online.

The authorities noted that these individuals utilized themes of self-harm on digital platforms to foster a sense of community and belonging among their followers.

In response to the identified threats, police launched raids across multiple states in Brazil, including São Paulo, Rio Grande do Sul, and Mato Grosso, to apprehend those involved in the plot.

The security measures for Lady Gaga's concert were notably stringent, with approximately 5,000 police officers, drones, and surveillance technologies, including facial recognition cameras, deployed to ensure the safety of attendees.

Public reaction was one of relief among fans, many of whom expressed concerns over the safety of the concert in light of the thwarted attack.

Prior to the event, fan accounts on social media conveyed gratitude for the police efforts, with one account expressing profound concern for the safety of attendees.

Lady Gaga's concert represented the second concert with a million-plus attendance on Copacabana beach within a year, following a major performance by fellow artist Madonna.

The concert was part of a broader initiative by Rio officials to attract tourists during what is typically the low season for travel.

Lady Gaga delivered a captivating show, beginning her performance in a striking scarlet hoop gown and delivering a series of tracks from her latest album, 'Mayhem', alongside classics from her discography.

The city, renowned for its vibrant carnival celebrations, has also been mentioned as a potential host for future performances by other major artists like the Irish rock band U2.