Page last updated at 05:08 GMT, Wednesday, 1 April 2009 06:08 UK

Tight security for G20 leaders

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A major security operation is swinging into action in London as world leaders gather for the G20 summit.

It will take place amid police warnings of "unprecedented" levels of protest.

Workers in the city's financial district have been told to dress down to avoid provoking demonstrators and some shops have boarded up their windows.

Tim Muffett reports.

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