G20 summit protesters have forced their way inside an RBS office in the City amid violent clashes with police as world leaders gather in London
Anarchists smashed windows of the building on Threadneedle Street near the Bank of England and looted office equipment and papers, throwing smoke grenades, chairs and eggs.
A printer was seen being thrown out of a window as the group of protesters, many with their faces covered by bandanas, ransacked the office, despite a huge security operation to protect Europe's financial capital.
Riot police have been deployed near the scene but the protesters appeared had a clear run of the building for several minutes. The bailed-out bank was known to be a target of anti-capitalist groups in advance of the protests, but police efforts had concentrated on defending its headquarters on Bishopsgate in Liverpool Street, around half a mile away.
Earlier, eleven arrests were reported before a tense standoff developed between rows of police holding batons and a surging crowd outside the Bank of England.
One man, bleeding from the head, was repeatedly seen to apparently goad officers, who did not respond.
At one point, a black-clad masked man in the crowd struck an officer with a long pole. The officer was pulled away by colleagues and required treatment at the scene.
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".
A spokesman said: "There are currently police cordons in place at Princes Street, Queen Victoria Street, Walbrook Street, King William Street, Lombard Street, Cornhill and Threadneedle Street."
See: G20 protests: Rioters loot RBS office after clashes in City