Brazilian President Luiz Inacio Lula da Silva said on Thursday that security force members were complicit in letting an anti-government mob ransack the seat of power in Brasilia, and promised to weed out hardcore supporters of his predecessor.

Iran PressAmerica: The task of screening out those actors will be complex, his senior aides said, but investigations have begun to see who was responsible for letting backers of former President Jair Bolsonaro storm and vandalize the presidential palace.

"There were a lot of people who were complicit in this among the military police. There were many people from the armed forces who were complicit," Lula told journalists. "I am convinced that the door to the palace was opened to allow these people in, because I did not see that the door was broken."

According to Reuters, Lula has also stepped up criticism of the army for not doing anything to discourage the two-month-old encampment of Bolsonaro supporters outside its headquarters, where they have been clamoring for the military to overturn the result of the October elections.

The Brazilian army did not respond to requests for comment.

Thousands of demonstrators calling for a military coup to oust Lula and restore Bolsonaro to power stormed the Supreme Court, Congress and the presidential palace on Sunday, leaving a trail of smashed windows, furniture, computers and artwork.

The police force responsible for public security in Brazil’s capital did not stop the mob advancing on the building, and some were seen in social media images taking selfies and chatting with demonstrators.

Riot police dispersed the crowd with tear gas and arrested some 1,800 protesters only after Lula ordered the federal government to intervene in local security.

Brasilia Governor Ibaneis Rocha, a Bolsonaro ally, was among the first blamed for security lapses. He was suspended from office on Sunday by Supreme Court Justice Alexandre de Moraes, who also ordered the arrest of his security chief and head of police.

Four on-duty staffers from the National Security Adviser’s office (GSI) were quickly overwhelmed inside the presidential palace and their office ransacked. They looked on as protesters kicked at the reinforced door to Lula’s office but failed to break in.

A presidential spokesman told Reuters that computers were taken from the National Security Adviser’s office and hard drives containing confidential information had disappeared. Boxes of taser guns were emptied, said spokesman Guto Guterres.

Presidential Chief of Staff Rui Costa said the government now faces the challenge of undertaking a “decontamination” of the security forces and holding those responsible accountable.

“We have several institutions that have been contaminated with Bolsonarista hatred by far-right coup-mongers,” said Institutional Relations Minister Alexandre Padilha.

Government officials said it remained unclear how soldiers or policemen who sympathize with demonstrators’ calls for a military coup would be identified or removed.

One idea proposed by Lula’s aides, aimed at discouraging the politicization of security forces, would be to limit military and police officers from running for elected office.

Brazil’s Congress has a growing number of retired and even active-duty officers who tout their military or police credentials as part of their law-and-order appeal.

“This excessive participation of the military and military police in politics is progressively leading to ideological contamination of the forces,” Costa said.

On Wednesday, Lula vetoed part of a bill passed by Congress under Bolsonaro that would guarantee the right of police officers to take part in political demonstrations.

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