Experts: Intervene early to cut youth violence

college student embarks on a shooting spree, taking 32 lives. A teenager with an assault rifle opens fire on holiday shoppers in a department store in middle America. And, long before that, two youths turn the halls of their high school into a virtual abattoir, leaving some 13 dead before killing themselves.

Blame for the explosion of violence by teenagers and young adults in recent years has fallen on everything from the breakdown of families to video games, from lax security to violent music.

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