What's real and what's fake? How AI is impacting Brazil's election race

With just two days to go before the first round of Brazil's presidential election, artificial intelligence is taking centre stage, whether it's a deepfake avatar of former president Jair Bolsonaro to support his son's candidacy, or an AI-generated working-class female voter criticising President Luiz Inacio Lula da Silva. According to the Brazilian intelligence agency, disinformation will be one of the main challenges of this election. Our correspondents report.