Brazilian police have arrested two people in connection with an alleged plot to detonate explosives at a Lady Gaga concert in Rio de Janeiro that drew more than two million people.

The police added that an adult “responsible for the plan” had been arrested along with a teenager in an operation codenamed “Fake Monster” – a reference to “Little Monsters”, the star’s pet name for her fans.

Felipe Cury, secretary of the Rio Police, said on Sunday that authorities believed the suspects sought to target Brazil’s LGBTQ community as they had “clearly” stated they were planning an attack “motivated by sexual orientation”.

Authorities in Brazil said two people were arrested in connection to an alleged bomb plot targeting Lady Gaga's concert Saturday in Rio de Janeiro.

Rio de Janeiro's state police and Brazil's Justice Ministry presented the bare outlines of a plot that they said involved a group that promoted hate speech against the LGBTQ+ community, among others, and had planned to detonate homemade explosive devices at the event.

Police said nothing about the alleged plot at the time in an effort to "avoid panic" and "the distortion of information."