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Cavanagh, thank you. >> thank you. let's bring in nbc's peter alexander on the ground in murrysville, pennsylvania. what can you tell us about the investigation as it stands right now? >> joy, we just got here within the last five minutes or so. i can tell you about a conversation i just wrapped up as we were driving to this live location to give you a sense of where we are right now in the distance back there, that's where you can see franklin regional high school. it's a way back there. this campus, there's an elementary and middle school as well. we're outside the elementary school. as yo...

For a world without nuclear weapons. i was a kid during the cold war and was so scared. i wanted a bomb shelter in the backyard. i remember bugging my dad about it. he said, oh, building one isn't the hard part. having a gun to keep the neighbors out would be hard. that was so scary when i was a kid. my mom said, oh, i would just take a pill. i wouldn't want to live through it. that was frightening. we stopped being afraid, but the weapons are still here. we have 22,400, i believe, at last count. the good news is we don't have 65,000, but when you could destroy the world x number of times over...