Police dubbed the investigation “Operation Fake Monster."

Per a statement issued Sunday by the Rio de Janeiro Civilian Police, two people were arrested on May 3 who police say were members of an online group “spreading hate speech and preparing a plan, mainly against children, adolescents and the LGBTQIA+ community.” The group — which was not named in the police statement — allegedly attempted to recruit others, especially teenagers, to carry out attacks at the concert using improvised explosives, Rio Police chief Luiz Lima told the Associated Press, with the goal of “gaining notoriety in order to attract more viewers, more participants.” No explosives were reportedly found during the investigation.