In Brazil, police have used tear gas to break up protesters on the second day of a metro strike that has left Sao Paulo's transport in chaos. Nearly half of the stations were closed and there was gridlock on the streets of Brazil's largest city, which will host the opening match of the World Cup next Thursday. Workers are demanding a pay rise of at least 10 percent. A new round of negotiations has failed and the strike will continue. A third of Sao Paulo's metro stations were closed on Friday morning, and there were more than 200 kilometres of traffic jams across the city in the morning rush hour.