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Boston Marathon bombing investigation continues
BOSTON, Mass. -- The investigation into the Boston Marathon bombing continues.
Investigators are looking into whether or not the Tsarnaev brothers had help building their bombs.
A government document obtained by ABC News says the alleged bombers likely knew more about bomb-making than they could have learned from the Al-Qaeda magazine, "Inspire."
Investigators say older brother Tamerlan Tsarnaev might have been trained in advanced bomb-making on a trip he made to Russia.