NEW : Madrid 's election board bans demonstration planned for late Tuesday overnight . A few hundred return late Tuesday to Madrid 's central Puerta del Sol plaza . A few hundred demonstrators camp out evening . The movement does not appear to be linked to the unions or political parties , the traditional protest heavyweights in Spain , said Economist Fernando Fernandez of the IE Business School in Madrid . Demonstrators are protesting Madrid 's 21 % unemployment rate .
NEW : Madrid 's election board bans demonstration planned for late Tuesday overnight . A few hundred return late Tuesday to Madrid 's central Puerta del Sol plaza . A few hundred demonstrators camp out evening . Demonstrators are protesting Madrid 's 21 % unemployment rate .