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Terror in Boston: America on Alert

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    Flags fly at half staff near Trinity Church April 16, 2013 in Boston, Massachusetts, in the aftermath of two explosions that struck near the finish line of the Boston Marathon on Monday. As a mark of respect for the victims of the senseless acts of violence perpetrated on April 15, 2013, in Boston, Massachusetts, US President Barack Obama issued a proclamation that the flag of the United States shall be flown at half-staff at the White House and upon all public buildings and grounds, at all military posts and naval stations, and on all naval vessels of the Federal Government in the District of Columbia and throughout the United States and its Territories and possessions until sunset, April 20, 2013. (Photo credit STAN HONDA/AFP/Getty Images)
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    NEW YORK, NY - APRIL 16: People depart an arriving train during the morning commute in Grand Central Terminal on April 16, 2013 in New York City. The city announced it has continued increased security one day after the Boston Marathon bombings. (Photo by Mario Tama/Getty Images)
    PHOTOS: Explosions Rock Boston Marathon
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    BOSTON, MA - APRIL 16: The unfinished meals of fleeing customers are left on tables at an outdoor restaurant near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images)
    PHOTOS: Explosions Rock Boston Marathon
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    The US flag above the White House flies at half-staff on April 16, 2013 in Washington, DC. At least three people were killed and over 100 wounded when two explosions struck near the finish line of the Boston Marathon on April 15. As a mark of respect for the victims of the senseless acts of violence perpetrated on April 15, 2013, in Boston, Massachusetts, US President Barack Obama issued a proclamation that the flag of the United States shall be flown at half-staff at the White House and upon all public buildings and grounds, at all military posts and naval stations, and on all naval vessels of the Federal Government in the District of Columbia and throughout the United States and its Territories and possessions until sunset, April 20, 2013. AFP PHOTO / Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
    PHOTOS: Explosions Rock Boston Marathon
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    NEW YORK, NY - APRIL 16: An Amtrak police special operations unit stands by outside of Penn Station on April 16, 2013 in New York City. Police were out in force throughout New York, a day after explosions near the finish line of the Boston Marathon killed 3 people and wounded more than 170 others. (Photo by John Moore/Getty Images)
    PHOTOS: Explosions Rock Boston Marathon
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    Boston police officers near a Humvee April 16, 2013 in Boston, Massachusetts, in the aftermath of two explosions that struck near the finish line of the Boston Marathon April 15. A massive probe was underway Tuesday after two bombs struck the Boston Marathon, killing at least three and wounding more than 100. Monday's blasts near the finishing line raised fears of a terrorist attack more than a decade after nearly 3,000 people were killed in suicide airliner strikes on New York, Washington and Pennsylvania on September 11, 2001. US President Barack Obama went on national television to warn against 'jumping to conclusions' but a senior White House official, speaking on condition of anonymity, said such an attack was 'clearly an act of terror.' AFP PHOTO Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)
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    BOSTON, MA - APRIL 15: A swat team arrives at the corner of Stuart Street and Dartmouth Street after two explosive devices detonated at the finish line of the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts. Two people are confirmed dead and at least 23 injured after two explosions went off near the finish line to the marathon. (Photo by Darren McCollester/Getty Images)
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    WASHINGTON, DC - APRIL 15: A U.S. flag flies at half staff on the U.S. Capitol April 15, 2013 on Capitol Hill in Washington, DC. Speaker of the House Rep. John Boehner (R-OH) has ordered to lower the flags after two people were confirmed dead and at least 100 injured after at least two explosions went off near the finish line of the Boston Marathon. (Photo by Alex Wong/Getty Images)
    PHOTOS: Explosions Rock Boston Marathon
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    NEW YORK, NY - APRIL 15: People walk through Grand Central Terminal in Manhattan on April 15, 2013 in New York City. The city has announced it will implement heightened security measures in response to today's bombings at the Boston Marathon. (Photo by Mario Tama/Getty Images)
    PHOTOS: Explosions Rock Boston Marathon
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    MIAMI, FL - APRIL 15: Miami Marlins players and fans stand for a moment of silence for the victims of the Boston Marathon bombing prior to playing against the Washington Nationals at Marlins Park on April 15, 2013 in Miami, Florida. All uniformed team members are wearing jersey number 42 in honor of Jackie Robinson Day. (Photo by Marc Serota/Getty Images)
    PHOTOS: Explosions Rock Boston Marathon
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    NEW YORK, NY - APRIL 15: A New York City police officer patrols outside the Barclays Center prior to a Brooklyn Nets basketball game on April 15, 2013 in the Brooklyn borough of New York City. Police say they have stepped up security following explosions at the Boston Marathon that resulted in two deaths and more than 100 injuries. (Photo by Bruce Bennett/Getty Images)
    PHOTOS: Explosions Rock Boston Marathon
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    LOS ANGELES, CA - APRIL 15: Cars stop at a checkpoint at the entrance of Los Angeles International Airport after security was increased following mutiple expolsions during the 117th Boston Marathon on April 15, 2013 in Los Angeles, California. California emergency management officials activated a statewide threath assessement system after the explosions. (Photo by Kevork Djansezian/Getty Images)
    PHOTOS: Explosions Rock Boston Marathon
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    WASHINGTON, DC - APRIL 15: U.S. President Barack Obama arrives in the White House briefing room to make a statement regarding the bombings that took place at the Boston Marathon April 15, 2013 in Washington, DC. The two blasts located near the finish line killed at least 2 people and injured scores more. (Photo by Win McNamee/Getty Images)
    PHOTOS: Explosions Rock Boston Marathon
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    NEW YORK, NY - APRIL 15: A New York Police Department officer inspects a man's bag in Grand Central Terminal in Manhattan on April 15, 2013 in New York City. The city has announced it will implement heightened security measures in response to today's bombings at the Boston Marathon. (Photo by Mario Tama/Getty Images)
    PHOTOS: Explosions Rock Boston Marathon
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    HICKSVILLE, NY - APRIL 15: A police officer with his K-9 companion keeps guard as a Long Island Rail Road train from New York City arrives at the station on April 15, 2013 in Hicksville, New York. According to reports, at least two people were killed and 28 injured in two blasts near the finish of the Boston Marathon on Monday. (Photo by Bruce Bennett/Getty Images)
    PHOTOS: Explosions Rock Boston Marathon
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    Policemen man their post at New York's Times Square after security was boosted following blasts that occured at the finish line of the Boston marathon, in New York, April, 15, 2013. At least two people were killed and 37 others wounded when two explosions struck near the finish line of the Boston Marathon, sparking scenes of panic. AFP PHOTO/Emmanuel Dunand (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)
    PHOTOS: Explosions Rock Boston Marathon
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    A news banner in New York announces casualties after blasts occured at the finish line of the Boston Marathon, April 15, 2013. At least two people were killed and 37 others wounded when two explosions struck near the finish line of the Boston Marathon,, sparking scenes of panic. AFP PHOTO / Emmanuel Dunand (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)
    PHOTOS: Explosions Rock Boston Marathon
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    Secret Service members are seen on the roof of the White House on April 15, 2013 in Washington, DC. Shortly after the Boston blasts, Secret Service officers cordoned off an area adjacent to the fence at the front of the North Lawn of the White House on Pennsylvania Avenue. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
    PHOTOS: Explosions Rock Boston Marathon
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    WASHINGTON, DC - APRIL 15: U.S. Secret Service and U.S. Park Police officers stand guard on Pennsylvania Avenue in front of the White House April 15, 2013 in Washington, DC. Security around the White House was tightened after two people are confirmed dead and at least 28 injured after at least two explosions went off near the finish line of the Boston Marathon. (Photo by Alex Wong/Getty Images)
    PHOTOS: Explosions Rock Boston Marathon