An estimated 1 million protesters took to the streets in more than 80 cities on Thursday night in the biggest show of anger yet against the government, which is being accused of corruption, high prices and a lack of investment in public services.
The worst confrontations unfolded late into the night in Rio de Janeiro, where more than 300,000 people protested in the city which is hosting key Confederations Cup games. Police fired tear gas and rubber bullets during battles through the streets.
When asked about the possibility of canceling the Confederations Cup, FIFA said in a statement to The Associated Press: "To date, neither FIFA nor the LOC (local organizing committee) have ever discussed any such possibility."
Mass protests have been rare in recent years in Brazil, a country of 190 million people, but an outpouring of public anger has been mushrooming over the last week.
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Some protesters have denounced the billions of public dollars spent on stadiums in advance of the World Cup and the 2016 Olympics in Rio.
The government is projecting that $13.3 billion will be spent on stadiums, airport renovations and other projects for the World Cup, with an estimated $3.5 billion on venues.
"We want hospitals and schools in FIFA standards," read one banner outside the Maracana Stadium in Rio on Thursday ahead of Spain's match against Tahiti.