By COLLEEN SLEVIN

       DENVER — The 12 students and one teacher killed in the Columbine High School shooting will be remembered Friday in a vigil on the eve of the 25th anniversary of the tragedy.

       The gathering, set up by gun safety and other organizations, is the main public event marking the anniversary, which is more subdued than in previous milestone years.

       Former Arizona Congresswoman Gabby Giffords, ...

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