>> reporter: in 2009 i asked explosives expert sydney alford to show me what a top al qaeda bomb maker was capable of. >> this is what six grams of petn does to something that is twice as thick as an aircraft fuselage. >> reporter: he mastered the white powder explosive petn. the al qaeda bomb maker made this, the underpants bomb targeting a u.s. passenger jet christmas 2009. here in russia, the rising question is likely to become who made the bomb that brought down metro yet 9268? was it isis, an isis affiliate, another radical islamic group or al qaeda? what we do know is that after the underpants bomb, al qaeda's bombs became even more sophisticated. 2010. printer bombs hidden in cargo on two planes. fortunately, they were
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