Riot police clash with protesters at Neptuno Square during demonstrations surrounding the Spanish Parliament on September 25, 2012 in Madrid, Spain. Demonstrators from various organizations, demanding a new constitutional process, are marching today from three different locations in the center of Madrid to the lower house in the Spanish parliament. (Photo by Pablo Blazquez Dominguez/Getty Images)
Demonstrators have clashed with police on the streets of Madrid in an upsurge of popular anger at new austerity measures being imposed on the country's teetering economy, which has resulted in unemployment and mass evictions.