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Aboard. egypt has accepted a rerequest from the united states to assist with the investigation. a source says that the national transportation safety board here in the united states will dispatch a team once it has details of when and where the plane's engines will be examined. the engines are u.s. made. meanwhile, they believe that the most likely scenario is that jihadis plant ed a bomb with c4. and now joining us is our terrorist expert paul cruikshank. and paul, c4 is military explosive powerful enough to bring down a plane, but how easy is it to obtain? >> well, we know that the group tha...

The bomb was likely made in part by an easily obtainable military-grade explosive, like c-4, according to two american officials. >> the groups that operate in that region from isis to al qaeda to even hamas, yes, they would have access to military-grade type of explosives. that's not a problem. >> reporter: now, all of this, of course, still very preliminary. if the u.s. gets more intelligence, the assessment, the very informal assessment they have right now could change. wolf? >> all right, barbara. thank you. if isis is proven to be responsible for this russian jet crash that killed all 224...

Military satellite at the time of the explosion, calculations about what might have happened, a number of u.s. officials are telling cnn they do have a working theory about this potential bomb. they believe at this point it was most likely placed on board by someone on the ground with access to the plane, probably not somebody that got past the screening process. may based on their calculations of the heat flash, the explosion that is believed to have been heard on one of the data recorders, they think at this point most likely it was military grade explosives, something similar to c-4, high e...

C4 is a military grade plastic explosive. crucially, isis in sinai has been stockpiling c4 explosives. it's been using that explosive in a number of attacks in the sinai peninsula in recent months. so certainly consistent with a hypothesis that isis affiliates carried out this attack. they have claimed that they carried out this attack. >> so if it is someone who had access, they don't think it was a passenger who brought it through the security check point. who would that leave? airline or airport employees? >> they would be looking potentially at someone with access to the plane. people hand...

Security lines at american airports. what kind of bomb could have been used and what kind of damage could even a small bomb do? we went to the experts to find out. >> reporter: that explosion a half pound of dynamite, a conventional explosive mainly used in industrial settings. it packs a massive wallop. the explosion moving about 19,000 feet per second. it could easily cripple a passenger aircraft. seems too simple. >> yeah, it is. well, when the bad guys make the improvised ones, it's the same process. you can see how fast it could be done. >> reporter: c-4, more powerful than dynamite. that...