Rio favela has 'more CCTV cameras than London'

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Police in Rio de Janeiro have started using CCTV to watch communities in Rocinha, the city's biggest favela which they claim to have 'pacified' in 2011 when they expelled a large number of drug traffickers.

They say it is now the best monitored places in the world, with a higher ratio of cameras per resident even than London.

Residents and police spoke of what effect they think the cameras will have on the neighbourhood.

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