Tens of thousands of workers marched Wednesday through the streets of Europe, decrying the loss of jobs and benefits they fear will come with stinging austerity measures seeking to contain government debt. Police fired shots in the air to disperse protesters at a general strike in Spain. Greek bus and trolley drivers walked off the job, joined by doctors who staged a 24-hour strike at state hospitals. Unions claimed a crowd of 100,000 marched on European Union headquarters in Brussels. From Ireland to Greece, workers united around the theme that they are victims of a debt crisis caused by reckless high-spending bankers undermining Europe's cherished welfare state. They complained of higher taxes, job cuts, soaring unemployment and smaller pensions. A demonstrator shouts slogans while marching in central Athens on September 29, 2010. Greeks joined the European day of action against the austerity measures. The banner reds "IMF out." Riot police detain protesters in Brussels on Wednesday. A demonstrator throws a plastic object on burning garbage containers in central Barcelona during the general strike held in Spain.