Boston Marathon blasts put world's cities on alert

Associated Press
Boston Marathon blasts put world's cities on alert

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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