There were violent scenes reminiscent of the U.S. Capitol riots two years ago when police clashed with supporters of former far-right Brazilian President Jair Bolsonaro.
Protesters broke into the Green Room outside of Congress' lower chamber after breaking down police barriers and shattering windows.
Images show floods of demonstrators dressed in Brazil's signature yellow and green converge on the lawn outside the capital building and ascend a ramp that leads to its roof, as police fire tear gas at them.
He was not in the building when it happened.
The protesters for weeks have been calling for military intervention to remove Lula, who returned to power 12 years after he last served as president following his narrow defeat of Bolsonaro.
After 20 years in power, the leader of the left-wing Workers' Party, Luis Inacio da Silva, was re-elected in October, making him the first candidate in 30 years to oust an incumbent president. He pledged to fight income inequality. He was jailed on corruption charges and was unable to run in the election. The way for his historic comeback was paved by the fact that his conviction was overturned in 2019.
In the months leading up to the election, Bolsonaro spread baseless conspiracy theories that the election was rigged and that government employees had the power to change the results. He fled to the U.S. so he wouldn't hand over power. His supporters have been engaged in destructive protests for months.
The police were accused of voter suppression in the presidential race.
The left wing of the Brazil election narrowly defeated the right wing to return to the presidency.
Brazil's election is over, but still hasn't been conceded.