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The discovery led to several closures in the city.
"I would urge the public to remain calm, but alert and vigilant,'' said London police Commander Richard Walton.
Between the street parties of Her Majesty's Diamond Jubilee and the athletic spectacle of the Olympics, London has a lot going on this summer. You don't need to bunk at Buckingham Palace to get an authentic British experience. The boutique hotel experts at Mr. & Mrs. Smith have picked out five one-of-a-kind spots to spend an authentically English evening in the capital.