President Offers Condolences to Victims of Boston Marathon Bombing

President Obama remarks on the Boston Marathon tragedy.
2:09 | 04/16/13

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Transcript for President Offers Condolences to Victims of Boston Marathon Bombing
President today addressed the nation calling the bombing an act of terrorism whoever is behind -- ABC's chief White House correspondent Jonathan Karl. Has been tracking the administration's response John tell us. -- -- -- plunged a short while ago the White House informed us that the president will travel to Boston on Thursday. Today -- attended interfaith memorial service for the victims of the marathon bombing earlier today the president summoned his national security team. Here to the White House including as attorney general. The secretary of homeland security and the FBI director. For a meeting in the Oval Office to get the latest on the investigation right after that meeting Diane the president came into the White House briefing room. And he told us that the American people refuse to be terrorized. But he also made it clear that this bombing was an act of terrorism. This was a heinous and cowardly act. And given what we now know about what took place for the FBI is investigating it as an act of terrorism. Any time bombs are used to target in -- civilians. It is an act of terror. What we don't yet know -- our. Is who carried out this attack or -- Weather was planned and executed by a terrorist organization. Foreign or domestic. Or was react a malevolent individuals. In -- senior officials here tell me they don't even have a working. Theory as to whether or not this was domestic terrorism or international terrorism some kind of -- al-Qaeda affiliated group they have actually no indication yet. They say the investigation is really only now are getting under way. Meanwhile the flag over the White House earlier today was lowered to half staff as you mentioned earlier -- that after the president issued a proclamation. Declaring that as a mark of respect for the victims of the senseless acts of violence perpetrated on April 15 2013. -- -- Flags at all federal buildings not just in the United States but all around the world including embassies consulates in -- military facilities will be lowered and kept at half staff. For the rest of the week.

This transcript has been automatically generated and may not be 100% accurate.

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