Tear gas has been used by Brazilian riot police against protesters in São Paulo, three days before the opening game of the World Cup in the city’s main stadium.
About 300 demonstrators were involved yesterday as helicopters circled overhead.
São Paulo metro workers, who called the protest, have since suspended a strike over demands for a salary increase.
Brazilian president Dilma Rousseff has said she would not allow violent demonstrations to mar the World Cup.
The strike, which began last Thursday, has caused widespread disruption in one of the world’s most congested cities.
A union spokeswoman told the BBC on Monday that they had suspended the strike for two days to allow for negotiations and that protesters would meet again tomorrow to consider their position.
If staff threatened with dismissal were not reinstated, the protest would resume on the opening day of the World Cup, she added.
There are concerns that any continuation of the strike could affect the opening match between hosts Brazil and Croatia.
Arena Corinthians stadium is on the outskirts of São Paulo and access to the venue without public transport could be a huge challenge for fans.
Meanwhile, a worker building a monorail in the city died and at least two others were injured after a section of the project collapsed.
The 17.7km monorail was originally meant to be completed for the start of the World Cup on Thursday, but it is behind schedule.
It was meant to connect the Congonhas airport, which handles mainly domestic flights, to three metro lines.