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Led by a samba band, protesters from the "Occupy" movement marched down streets in London.
Demonstrators then broke into an office building used by mining company Xstrata protesting at the pay of the company's chief executive.
Police threw a cordon along the Haymarket, effectively sealing off the area before arresting some of the protesters.
Karen Lincoln of Occupy London said in a statement, "in this time when the government enforces austerity on the 99 percent, these executives are profiting."
Their protest is part of a global movement of social and economic change.
They say economic and political power lies in the hands of just 1 percent of the population.
Scuffles broke out between Occupy protesters and police as they tried to clear the streets.
This took place on the same day as hundreds of thousands of public sector workers went on strike across Britain to protest over pension reform.
Marie-Claire Fennessy, Reuters
