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Police find 'good evidence' on motive for Connecticut school massacre (1:34) 

Briefing reporters in Newtown, Connecticut State Police Lieutenant Paul Vance said police have uncovered ''very good'' evidence that should help determine why a gunman forced his way into an elementary school and killed 20 children in one of the worst shooting rampages in U.S. history. Rough Cut (no reporter narration) ( Transcript )

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