US President Barack Obama speaks on the Boston Marathon bombings on April 16, 2013 in the Brady Briefing Room of the White House in Washingoton, DC. Obama on Tuesday branded the Boston bombings a "cowardly" act of terror, but said it was still unclear if a foreign or domestic group or individual was behind the attacks. "This was a heinous and cowardly act," Obama said at the White House. "Any time bombs are used to target innocent civilians, it is an an act of terror." AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
US President Barack Obama speaks on the Boston Marathon bombings on April 16, 2013 in the Brady Briefing Room of the White House in Washingoton, DC. Obama on Tuesday branded the Boston bombings a "cowardly" act of terror, but said it was still unclear if a foreign or domestic group or individual was behind the attacks. "This was a heinous and cowardly act," Obama said at the White House. "Any time bombs are used to target innocent civilians, it is an an act of terror." AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

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Obama: queremos saber por qué

Obama hace hincapié en que se quiere investigar si fue un acto terrorista aislado o como parte de un grupo.
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Obama: queremos saber por qué

Obama hace hincapié en que se quiere investigar si fue un acto terrorista aislado o como parte de un grupo.
Source: CNN