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Let's listen. >> we're fundamentally ready the go. there's always stuff to be done. we're still building the stage and altar. all the security fencing has to be put. it will be tons of stuff to do. from planning and preparation standpoint we're good to go. >> obviously the mayor making the point there's still a lot of work to do. as far as you know, this is something that authorities know how to do. they've dealt with big dignitaries. no one is probably as big a challenge as the pope. you believe their ready. >> philadelphia being the fourth largest police department in the country. commission...

Enforcement deeply suspicious that this was not sort of an accidental event, some sort of gas explosion or water pipe explosion, but that it was actually intentionally set. and so they're going to comb through that pretty deliberately to try and figure that out. but i will tell you at first blush, to those in the community, it looks like it was, in fact, a bombing. >> and, fran, we're told that other cities are going on heightened alert. you heard from jessica yellin our senior white house correspondent saying the white house is in something of a lockdown mode. is this just protocol? >> it is ...