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Thousands of police officers patrol in London

??As the opening ceremony of the Olympics approaches, London is covering its bases with an influx of security forces on the ground, in the air and in the water. But officials still worry about the possibility of a ?soft target,? such as an attack on a bus, that would have a huge emotional impact on the city. NBC?s Stephanie Gosk reports.

Source: http://www.msnbc.msn.com/id/3032608/vp/48275997#48275997

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