Police in the U.S. have been filmed beating back protesters at a mass demonstration in New York, in the biggest event yet in the three-week-long rally called 'Occupy Wall Street'. There are also reports pepper spray's been used, and police have confirmed they've made dozens of arrests at the rally. Thousands have been taking part in sustained protests to demand social and economic change. Activists say they're fed up with breaking their backs at work, while the Wall Street bankers' bonuses keep flowing.

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