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A five gallon bucket. normally a device like that will not contain really well an explosive device. you want to tamp those explosives so they're in a metal container to create blast-over pressures and that will explode your device, whatever it is you have in there. so that leaves either an incendiary device or gas device which could explode itself or dissipate itself in that plastic bucket. our first thought, and i was discussing this with many -- a couple of international terrorism experts. we were chatting this morning. the first thought was, it was a gas device. something which can be activ...

Inside. twisted nails, screws, screw heads and items like that to act as fragmentation projectiles. and we've seen a lot of evidence of that. even seen eyewitness testimony where people had nails and screws projected across their bodies. more importantly is the blast device, it knocked people physically off their feet. i've been around a lot of bombs. i've been in the radius of multiwill suicide bombings and the blast effect tells you this is not a -- >> some of the things coming out suggest that redundancy was built into this bomb and it was not as crude a design as the typical they know you ...

Backpack. that is what we call the da item. that is the point of origin of the bombing. from that point we can figure out based on the blast injuries, the victims, whether this was a suicide bombing or not. unfortunately, british police obviously found that the casualty with the most extensive injuries was probably a suicide bomber based on the blast effect of moving those body parts at the various different directions. >> malcolm, i know you've written extensively and you have extensive experience professionally in fighting against al qaeda and isis. if this is a suicide bombing, if this is a...

In shorthand, largest nonnuclear bomb the air force has in its convinces. >> well, this bomb is 11,000 -- it's 11 tons of tnt, so it's going to set off an enormous blast. it will feel like a nuclear blast to anyone in the area. there's the psychological thing. you have to figure out what weapon you want to use when a target presents itself. in this area, mountains and caves and this tunnel complex, you want something that's going to be able to get a blast effect into those caves, into those tunnels. this is the weapon to do that. the pressure from this weapon will send shock waivves through th...

Would use chemical weapons in the first place. he doesn't need them. he already has the upper hand. he has the support of the russians and iranians and his military is on a roll. he just invited all of this international criticism for using chemical weapons. very confusing as to why he would do that. >> is it that far out of character with assad and use of military force because whether it's chemical or barrel bombs, part of his military campaign is to specifically and intentionally target civilians as a mean of scaring the heck out of not just sifthe civilian but forces supporting them. >> ex...