abc s devin dwyer from washington. good morning, devin. reporter: good morning. the boston marathon attack is the first successful bombing in the u.s. since the september 11th, 2001 attacks. now the full weight of the u.s. government is behind the search for who is responsible. authorities this morning are poring over this dramatic video from the finish line for clues. bomb technicians are studying burn marks on bricks and concrete, and at hospitals doctors are collecting pieces of shrapnel that were blasted into bodies. they re going to look at the components of the bomb. it will tell them is this somebody that puts this together over the internet, or is this a bombmaker? reporter: officials believe these were two small and portable devices, possibly hidden in a backpack. one working theory, they were remotely detonated by a cell phone. but right now it has all the indicators and every aspect of being an al qaeda or al qaeda affiliated attack. reporter: so far ther
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