Twenty-six people — 20 students and six adults — were shot and killed at the Sandy Hook Elementary School in Newtown, Connecticut on December 14. As the nation continues to mourn, questions are beginning to be asked:

- Should teachers be armed?

- Can we stop active shooters?

- How do first responders prepare themselves for such a tragedy?

In this special report, we bring news from the scene and offer expert perspective on the tragedy:
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