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Associated Press
British police officers make final checks in the Mall, prior to the beginning of the London Marathon near to the finish line for marathon is situated in London, Sunday, April  21, 2013. Security has been stepped up in London following the recent bombs at the Boston Marathon. The London Marathon started as planned on a glorious sunny morning Sunday despite concerns raised by the bomb attacks on the Boston Marathon six days ago. (AP Photo/Alastair Grant)

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