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Those statements in contradiction to egyptian statements. what are investigators looking for? kyung lah is "outfront." >> reporter: the power of a bomb aboard a passenger plane. this demonstration by the u.s. attorney's office shows the end result. >> coming through the office. >> reporter: the beginning tracked by forensic bomb expert thomas anthony. >> is this a classic c-4 explosion? >> it is. less push and more force. we have less residue than a low explosive. >> reporter: starting with a c-4 bomb, he walks us through the impact of several types of bombs and the telltale signs they believe...

The beginnings tracked by forensic bomb expert thomas anthony. >> this is a classic c-4 explosion? >> it is. less push and more sort of force like that. we have less residue than a low explosive. >> starting with a c-4 bomb, a type of plastic explosive, the civil aviation security measure caulk wauks ugh floug the impact of several types of bombs and the telltale signs they leave behind. >> the residue of the black powder coming from to a central point, look at the edges here. the edges in the black powder very, very different. they have this sort of like almost coral-like look to them. this i...

Say, what do we see? what is in tact and what is not? where do we see burning if there's any kind of burning and does that tell us where this was if, in fact, it was a bomb. >> tom foreman, thank you very much. i want to go deeper on this. "outfront" now, safety inspector david soucie along with bob baer, former cia operative. bob, you've been saying since the very beginning you thought this most likely was a bomb. if so, what kind of bomb do you think it was? >> i think it was probably a professional job. you can take down a plane with plastique explosives, like t & t, anything like that to...

>> so we know they targeted the irs, they destroyed evidence and the just department says no go. is this a precursor of or a preview of coming attractions if the fbi were to find information about benghazi, about the clinton foundation or confidential top secret information on the deleted e-mails? does it mean it's politicized to that degree? >> sean, we have all kinds of confidence in the fbi. what we don't have confidence in is the justice department. jason's right. there's all kinds of e-mail evidence where she said the tea party is dangerous. where she says we're going to start a c-4 proje...

>> so we know they targeted the irs, they destroyed evidence and the just department says no go. is this a precursor of or a preview of coming attractions if the fbi were to find information about benghazi, about the clinton foundation or confidential top secret information on the deleted e-mails? does it mean it's politicized to that degree? >> sean, we have all kinds of confidence in the fbi. what we don't have confidence in is the justice department. jason's right. there's all kinds of e-mail evidence where she said the tea party is dangerous. where she says we're going to start a c-4 proje...