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Photo by: Dave Weaver

The U.S. flag flies at half staff Thursday Jan 6, 2011, outside of the Millard Public Schools Administration Center in Omaha, Neb. The 17-year-old gunman who opened fire at his Nebraska high school, killing an assistant principal, had been suspended from class and removed from the building hours earlier for driving on an athletic field, police said Thursday. (AP Photo/Dave Weaver)

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