The Riocentro attack (Portuguese: Atentado do Riocentro) was an attempted terrorist attack that took place on the evening of 30 April 1981, during a May Day celebration concert at the Riocentro convention center in Rio de Janeiro, Brazil. The bombing, carried out by officers of the Brazilian Army, was a false flag operation intended to frame left-wing guerrillas as violent and thereby halting the country's transition towards democracy. It ended up having the opposite effect, accelerating the end of Brazil's military regime, in power since 1964.