Commuting chaos has entered its second day in Sao Paulo, a week before the opening match of the World Cup, in protest over housing conditions.
Police used tear gas to break up a demonstration blocking access to one metro station, but a third of the city's subway stops remained closed early in the morning.
The strike already set a record on Thursday for morning gridlock in Sao Paulo this year, with many people now using the already stretched bus services in the city.
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