Madrid - Spain's parliament took on the appearance of a heavily guarded fortress on Tuesday, hours ahead of a protest against the conservative government's handling of the economic crisis.
The demonstration, organised behind the slogan "Occupy Congress", is expected to draw thousands of people from around Spain and was due to start around 17:30 GMT.
Madrid's regional interior ministry delegation said some 1 300 police would be deployed though protesters say they have no intention of storming the chamber, only of marching around it.
They are calling for fresh elections, claiming the government's austerity measures show the ruling Popular Party misled voters to get elected last November.
The protest comes as Spain struggles in its second recession in three years and with unemployment near 25%.
Spain has introduced austerity measures and economic reforms in a bid to convince its euro partners and investors that it is serious about reducing its bloated deficit to 6.3% of gross domestic product in 2012 to 4.5% next year.
Concerns over the country's public finances was evident earlier when the Treasury sold €3.98bn in short-term debt but at a higher cost.
It sold €1.39bn in three-month bills at an average interest rate of 1.2%, up from 0.95% in the last such auction on August 28, and €2.58bn in six-month bills on a yield of 2.21%, up from 2.03%.
The government is expected to present a new batch of reforms on Thursday as it unveils a draft budget for 2013. A day later the results of bank stress tests carried out by an international auditing company are to be released.
Spain has already been granted a €100bn loan by its 16 partner nations using the euro currency to help bail out those of its banks worst hit by the collapse of the country's real estate sector in 2008.
Spain has yet to tap the fund and initial estimates say the banks will need some €60bn.
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