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Furious protesters have attacked a Royal Bank of Scotland's branch in the City of London, smashing its windows and breaking into the building.
The branch, which appeared to be empty, was hit by a hail of missiles including plastic bottles and toilet rolls.
Scotland Yard said around 4,000 people had gathered outside the Bank and cordons had been put up in response to "increasing levels of violence".
Environmentalists, anarchists, anti-war protesters and workers hit by the financial crisis are demanding action from world leaders.