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Police cordon off the area in front of the White House in Washington, DC, on April 17, 2013 following attacks at the Boston marathon. US President Barack Obama condemned the April 15th attack at the marathon finish line as "an act of terror." He will attend a special service for the victims in Boston on April 18. US investigators zeroed in Wednesday on the suspected pressure cooker bombs that exploded at the Boston marathon, killing three people and injuring more than 180, as they hunted for perpetrators.    AFP PHOTO/Jewel Samad        (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
Police cordon off the area in front of the White House in Washington, DC, on April 17, 2013 following attacks at the Boston marathon. US President Barack Obama condemned the April 15th attack at the marathon finish line as "an act of terror." He will attend a special service for the victims in Boston on April 18. US investigators zeroed in Wednesday on the suspected pressure cooker bombs that exploded at the Boston marathon, killing three people and injuring more than 180, as they hunted for perpetrators.    AFP PHOTO/Jewel Samad        (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

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