Evidence on Display

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A video that authorities in Jefferson County released today shows the Columbine killers gleefully hinting at murder and mayhem just five months before the 1999 massacre.

The videos are part of the first public display of evidence collected in the nation's worst school shooting.

The video shows Eric Harris and Dylan Klebold wearing trenchcoats and sunglasses and walking through the school hallways calling themselves hit men out to protect students victimized by bullies.

At one point the two roar obscenities and threats into the camera -- their faces taking up the entire screen.

The video is a compilation of tapes recorded in the months before the two teens gunned down 13 people in a suicidal rage. They killed 12 students and a teacher before killing themselves.