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From that aircraft, from individuals who were on the plane, from luggage, and it shows an explosive residue, then we can't with any certainty say this was the cause. >> so, you seem to be frustrated. and you're the chairman of the intelligence committee. i assume u.s. intelligence officials are frustrated that the egyptians are not letting the u.s. get direct access to the site of that crash. >> well, i certainly think that we could lend to the investigation in a supplemental way. and so far, we have not been able to do that, even with the offer of the fbi involvement. >> we're hearing that it...

Pointing towards an insider at the airport inciting a device on the plane. you do have to match those up with what you're hearing on the black box. the forensics, whether they are seeing the telltale signs of an explosion in the wreckage and whether there's bomb residue from explosive trace detection steps. we haven't had had those results in yet. the russians have been promising in the next 24 to 48 hours they may have some results. everybody will be keenly awaiting that. the idea that c4 may be involved, it's relatively difficult to get it. and it's an organized terrorist group responsible i...

Explosion, picked up on a flight recorder, add to the u.s. view, a highly dynamic bomb exploded, one official told cnn, the bomb was likely made, in part, by an easily attainable military grade explosive like c-4, according to two american officials. >> the groups that operate in that region from isis to al qaeda, they would have access to military-grade explosives, that's not a problem. >> for now, u.s. officials say there's no intelligence to indicate the attack was ordered directly by isis back in syria. all of this could change as the u.s. gets more information and more intelligence. >> ba...

>> even more powerful than diet mite. how many feet per second? >> 30,000. >> that's just over a half pound of c4, a plastic explosive that is tough to go out and buy in the united states, but in some countries a similar explosive can be bought on the black market. >> joining me to discuss this is safety analyst david suz si, a former safety inspector. this video is eyebrow raise whg you see how small this is, the power that's in something this small. how sophisticate rd devices like this. how easy are they to make and to hide? >> well, as far as of the ease of hiding, can you get into it into...

So if the growing consensus is that a bomb took down flight what type of bomb could have been used? >> reporter: that explosion a half pound of dynamite, a conventional explosive used in industrial settings impacts a massive wall. the explosion moving about 19,000 feet per second could easily cripple a passenger aircraft. >> seems too simple. the improvised ones it is a simple process. >> reporter: c-4 more powerful than dynamite. that is how many feet? >> that is over a half pound of c-4 also conventional. in some countries a similar explosive can be bought on the