The young people camped out in the center of this capital to demand new economic policies amid a jobless rate of more than 21 percent vow to maintain the protest until at least Sunday, when Spaniards go to the polls for regional and municipal elections.

About 200 people were occupying Madrid's emblematic Puerta del Sol square Wednesday, hours after a crowd estimated at more than 10,000 filled the plaza.

Police forcibly evicted some 150 protesters from the area early Tuesday, but have declined so far to intervene again.

In an assembly held overnight, the group decided to maintain their protests around the clock through election day and to convene a large mobilization for the end of this week.

The activists' manifesto, issued Tuesday, rejects any connection with political parties or other established organizations and calls for a society that puts human dignity ahead of economic interests.

Similar demonstrations are taking place in Spain's other major cities, including Barcelona and Valencia.

United by anger over the state of the Spanish economy and disenchantment with politicians, the 15-M movement - so named for the May 15 launch of the mobilizations - is made up of numerous small groups and operates largely via Internet social networks.

The effects of the global recession and the bursting of a decade-long property bubble have been particularly severe for Spanish residents under 25, who suffer a jobless rate of more than 40 percent.

Spain faces the prospect of a "lost generation," the International Monetary Fund said in a May 13 report.