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Either he attempted to make a high explosive like ammonium nitrate or catv or some of the things you've heard of and failed in the chemistry, the o actual mixture of the component, in which, when he went to detonated, the blasting cap went off but the actual high explosive didn't, or he did what i believed to more common option. he tried to use a lower explosive like black powder, almost like gunpowder, and when you do that, the container you put it in has to stay contained. that's why they use pressure cookers and threaded pipe. it has to stay contained and allow for enough time for that lowe...

Explosives, you call a smaller explosive with a higher explosive with more volatile explosives. what look like king at the video is either the difference between the initiator, the blasting cap like a shotgun shell, that went off, but the main charge did not. it was a low order, and also in evidence of that with the picture of his body with a lot of lacerations. the other idea is that he use a low explosive device like black powder, and when you sent that off, any weakness in the container, it will vent. in other words blowing up, it will burn out. the video can show either of those scenarios....

Had to be in the cabin of the plane to flip the switch. how could someone get on the plane with a device. >> with this device, it has a high metal signature. from the soda can to the battery and wires. this would be difficult to circumvent normal security. >> reporter: u.s. officials have run the names on the passenger manifest list and found no red flags of anyone on board. isis claimed responsibility for the attack that killed 224 people, but if this is the bomb, it would be the first piece of evidence the group has put forward. >> the soda can has arabic writing that puts it in the region. ...

A device like this would be difficult to circumvent normal security. >> isis claims responsibility for the attack that killed 224 people. but is thisst the bomb, it would be the first piece of evidence the group has put forward. >> the soda can has some arabic writing that puts it in the region. the detonator or blasting cap is a commercially manufactured cap that we have seen in that region. >> well, more skeptical bomb experts question why the explosive material wasn't shown in that picture and why isis didn't produce video proof of them making a bomb. as millions of americans prepare to tra...

A simple detonator. a bomb expert said it contains a blasting cap, wires and toggle switch attached to a battery. isis claims these items were all hidden inside that can. is that true? is that reasonable? let's talk to cnn safety analysis david soucie, author of "why planes crash." we also have cnn political analyst josh rogen who writes about national security and foreign affairs. david, from what you can see in this picture, we were told this was a one kill low gram, 2.2 pound, explosive that took down the plane. now they're saying it's a soda can. is what you see compelling? >> well, it's n...