Bombings at the Boston Marathon finish line

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Two devices concealed in backpacks detonate about twelve seconds apart near the finish line on Boylston Street at roughly 2.50 pm, during the 117th running. Three spectators are killed — Martin Richard, Krystle Campbell and Lu Lingzi — and more than 260 people are injured. The attack targets the place where a city gathers to watch strangers finish, and the security architecture of every mass marathon since has been rebuilt around it.

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