SAO PAULO, Brazil -- The trade association representing Sao Paulo's bus companies says the strike by bus drivers demanding higher pay in Brazil's largest city is losing steam as it enters a second day.

The strike comes less than a month before the June 12 opening of the World Cup in Sao Paulo.

SP Urbanuus press officer Regina Helena Alonso said Wednesday that 60 per cent of the city's more than 8,000 buses were circulating. In the first day of the work stoppage strikers kept almost the entire fleet off the streets or used the vehicles to block avenues and streets.

Also on Wednesday, civil police in 14 states went on a 24-hour strike demanding higher pay. The striking officers are investigators and are not involved in patrolling the streets.