A sign is displayed by the road side warning of a British police security operation taking place along the forthcoming London 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)

Associated Press
A sign is displayed by the road side warning of a British police security operation taking place along the forthcoming London 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)
A sign is displayed by the road side warning of a British police security operation taking place along the forthcoming London 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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