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As Americans reel from a horrific act of violence in Newtown, Conn., debates over gun control, mental health care and children's safety have reopened across the US and beyond. GlobalPost brings you news and analysis from around the world in the wake of a shooting that left 20 children and eight adults dead.

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Reactions to Newtown's Sandy Hook school shooting pour in on Twitter

Tragedy brings people together on Twitter.

Connecticut's Sandy Hook elementary school became a central focus on Twitter as users shared responses to the killings of 27 people, at least 18 of them children.