you've seen from all of the fragments of the bomb, the batteries, the way this device was set up, the modus operandi of two people who were calmly checking out the vicinity, probably planned this for quite some time, bit look of it, does it add up to a classic al qaeda strike if it turns out to have been that? >> it does. i don't -- so far i haven't seen any mistakes they've made. somebody has coached them. again, they cased the place to make sure backpacks weren't bei being searched, the fact there was a remote-controlled detonator shows a certain amount of sophistication, two bombs. we used to call that double-tapping. you always do everything in twos. it was a military operation in that sense. and the fact that both detonators went off. that's not always assured. it has the ring of something of experience. it really does. and it very well could be al