Demonstrator Sara Lima told AFP they were demanding a review of the “fraudulent election”.
Lula won the runoff by a score of 50.9 percent to 49.1 percent. Bolsonaro, who left for the US state of Florida on the second-to-last day of his term, has alleged that he is the victim of a conspiracy against him by Brazil’s courts and electoral officials.
“I am here for history, for my daughters,” said the 27-year-old Lima, wearing the yellow jersey of Brazil’s national football team.
Fellow protester Rogerio Souza Marcos said the election was plagued by “many signs of fraud and corruption”.
The newly installed Minister of Justice and Public Security, Flavio Dino, called the invasion “an absurd attempt to impose (the protesters) by force”.
“It will not prevail,” he wrote on Twitter.