Officials in Argentina said Mr. Bolsonaro entered the country by land then flew to Ecuador. Brazilian police had asked him to hand over his passports because of his links to an investigation.

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Supporters of the opposition movement that won Sunday’s election stormed the offices of a pro-government tabloid. Another news outlet apologized for years of “one-sided” coverage.

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Brazil’s Supreme Court told the police to seize passport of Mr. Bolsonaro, who lost the presidential election, over his links to an investigation.

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President Luiz Inácio Lula da Silva triumphed over Flávio Bolsonaro, the eldest son of the right-wing leader he defeated four years ago.

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Luiz Inácio Lula da Silva, the leftist incumbent, and Flávio Bolsonaro, the right-wing challenger, face off in a narrow race that could redefine the future of Latin America.

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