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Right now, part of what they're doing is helping to assemble the evidence. they'll have evidence collection teams that will be looking for, you know, the weapon, the rounds, recovered rounds, the cartridges that will be there. trying to help the local police and authorities put together an understanding of who did this, how did they do it, and, again, like every mass shooting we've looked at in the last month, last year, the last ten years, it's did anyone else know this person was going to do it? did anybody else help him or participate? that's what we're trying to understand. >> and as we co...

Take us a little inside. what's it like? what are you seeing as far as security preparations on the ground, nick? >> reporter: it's quite remarkable, actually. i've been to this town before when it was embracing itself the way it is. quite a difference when i got off the plane this afternoon. a number of people in track suits there to greet those arriving for the olympics. but as you drive in towards the town, you notice the fact that some streets are emptied. there seem to be the occasional core don put up. it's still early days so all of the various dragnets and core donees in place. you do ...