A strike by metro workers in Sao Paulo, Brazil’s biggest city has been suspended. br But the industrial action could resume on the opening day of FIFA’s 2014 World Cup.br br A union spokesperson said the strike could start again on June 12 depending on whether 42 workers who have been fired are re-instated.br br The walkout is in support of a 12 percent pay claim which is well above the company’s offer of 8.7 percent.br br On Monday police fired teargas at metro workers who were holding a rally in Sao Paulo city centre.br br Brazil has experienced months of unrest and pay strikes as anger has boiled over at the cost of staging football’s most important tournament .br br In Rio de Janeiro striking teachers were the latest group to protest . They added their voices to demands for the government to spend more on education and healthcare.