them just to see whether they would go off by accident, and they have not. so that tells us that perhaps not everything was done right or this person was a good enough bomb maker to know how not to set it off. again, these are the working theories they're going on at this point, but you pointed out the right thing at this point. >> what's your initial reading? >> a couple things. first of all, important to understand that there is a difference between a post office and a mail sorting facility. there are about 250 mail sorting facilities throughout the country. >> right. >> i believe there were three of them within 20 blocks of where we are right here in the cnn building. you mentioned the total containment vessel, which is the vehicle that the nypd is going to bring to take the device out, place it inside there. it looks like a white spear or orb and transport it up into the