“Today’s tragedy comes on the heels of that other mass shooting 72 hours ago in the mall filled with holiday shoppers outside portland. This singular tragedy in newtown, joining the ranks of the other dark days, coe, tus an, aurora. Pierre thomas now tells us what the experts say they see when they look at the men behind these massacres.

Reporter: The virginia tech A shooting spree in tucson, arizona –six dead. 12 killed at a colorado movie theater. Mass murder conducted by a lone gunmen.

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