Brazilian security forces have taken control of Congress, the Supreme Court and the presidential palace, institutions that were previously stormed by supporters of former president Jair Bolsonaro, the media reported.
Brasilia Governor Ibanez Rocha announced on Twitter that more than 400 people had been arrested, while Justice Minister Flavio Dino said that at least 200 protesters had been arrested.
"The guilty will pay for the crimes they committed," Roša said, CNN reported.
"This is terrorism, this is a coup d'état. We are sure that the vast majority of the population does not want this darkness to be applied," said Dino at the press conference.
He also accused security forces in the region, commanded by a Bolsonaro ally, of being "negligent" during Sunday's protests, reports N1.
Meanwhile, Brazil's Supreme Court Justice Alexander de Moraes suspended Brasilia Governor Ibanez Rocha for 90 days, citing security lapses that allowed Bolsonaro supporters to storm Brazilian government buildings.
Bolsonaro's supporters threw furniture through the broken windows of the presidential palace, flooding parts of Congress with fire protection systems and destroying ceremonial rooms in the Supreme Court.
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The party of the former Brazilian president, who has never explicitly acknowledged his defeat in the October elections, condemned the attack, saying it was a "sad day for the Brazilian nation".
"Today's events in Brasilia are a shame for all of us, they do not represent our party, they do not represent Bolsonaro. We support peaceful protests. Today's actions are a shame," said Bolsonaro's Liberal Party leader Valdemar Costa Neto in a video released on Sunday.
Bonus video:
