Police lockdown in London to prevent new riots

 Updated at: 0647 PST,  Saturday, August 13, 2011 LONDON: Police in London flooded the streets on Friday in a move to prevent a repeat of England's worst riots in decades, which left city neighbourhoods smouldering and five people dead.The number of officers in the British capital was more than doubled to 16,000 earlier this week, and Home Secretary Theresa May said the extra police would