Eleven people have been arrested after a day of protest in London saw anti-capitalists from the Occupy movement pitch tents outside the Bank of England.
The arrests were made for public order offences linked to the demonstrations, leading to around 10 tents being set up, City of London Police said.
The protest by around 300 demonstrators was part of a global day of action which also took place in cities including New York, Athens and Madrid.
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Paramedics were on standby outside the police cordon as armed officers stood by the property.
A team of researchers has taken samples from the ten busiest London Underground lines to work out which are the dirtiest.
The action comes on top of an emergency timetable which has seen hundreds of trains a day being axed.