World responds to Boston bombing

Associated Press
Back dropped by the landmark commonly known as, Big Ben, a warning sign for road closures at the forthcoming London Marathon is displayed along the marathon route in London, Tuesday, April 16, 2013. British police are reviewing security plans for Sunday's London Marathon, the next major international marathon, because of the bombs that killed three people at the marathon in Boston Monday. (AP Photo/Sang Tan)

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In the wake of the Boston attacks, several countries, including France and Great Britain, have ordered local authorities to step up security and reinforce measures already in place. 

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