Two explosions near the finish line of the Boston Marathon killed three people and injured more than 150 on April 15, 2013. Security tightened in cities across the country as the investigation began.
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A police dog inspects cars entering the area of the New York Stock Exchange on Wall Street In New York City on April 16, 2013. New York City and Washington, D.C are tightening security in wake of the blasts at the Boston Marathon which killed three and injured at least 176. UPI/John Angelillo
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