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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.