Updated: April 18, 2013 at 10:11 AM
Boston Marathon bombing (59 images)
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.
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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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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People walk through Times Square as U.S. President Barack Obama addresses the nation in New York City on April 15, 2013. Many American cities are on alert after two bombs exploded near the crowded finish line of the Boston Marathon killing two people and injuring more than 125 others. UPI/John Angelillo
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The NYPD shows a strong and increased presence in Times Square in New York City on April 15, 2013. Many American cities are on alert after two bombs exploded near the crowded finish line of the Boston Marathon killing two people and injuring more than 125 others. UPI/John Angelillo
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