Some of the latest protests against the Spanish government’s planned spending cuts turned violent.
In Madrid, police said that some 40 people had been arrested since the strike began in the early hours of Wednesday morning.
In Barcelona, demonstrators hurled objects at security forces and set fire to a police vehicle.
Meanwhile, protesters in Valencia tried to storm a government building. Several were injured in the clashes.
Ministers say the austerity measures are necessary to boost an economy where 20 percent of the workforce is currently unemployed.
Unions countered that ordinary people are being made to pick up the tab for mistakes made by bankers and traders.