The report -- a compilation of 5,000 interviews and 10,000 pieces of evidence -- includes new surveillance video shot from inside the school's cafeteria, showing the two gunmen setting fires and tossing explosives.
Families of 15 victims demanded the report's release as part of a lawsuit that accuses police of responding too slowly to the attack. In Denver, Barry Arrington, an attorney for five of the families, told CBS News Early Show Co-Anchor Jane Clayson that the report is what they expected.
We were expecting the Sheriffs Department to deliver something shiny, something that glossed over any missteps, which is exactly what this does.
The report concludes that there was no evidence that there was a third shooter or that anyone had prior knowledge of the killers' plans.
Arrington feels the report is biased.
This is a report on actions written by those who took the actions! It is inherently biased, Arrington said. It's, I guess, no surprise there was no criticism.
One of the problems, from the families point of view, is that the police waited outside the school while the shooters were completely unimpeded.
The rampage began around 11:19 a.m., and the first 911 call came four minutes later. Yet it was more than three hours before SWAT teams made it to the library where most of the shooting took place. During that time, teacher Dave Sanders died of his wounds and 23 other wounded people waited for help.
The shooters, Eric Harris and Dylan Klebod, killed themselves 49 minutes after the shooting began.
As you can see from the video, the shooters walked through the halls of that school with impunity. You have to keep in mind, as they were walking through the halls of the school, there were police officers, sheriff's deputies just on the other side of the walls, not doing anything, said Arrington.
We never find out why deputies sat outside and did nothing while gunmen were strolling up and down the halls killing kids.
According to Arrington, two things went wrong.
The agency under review shouldnt be doing the review. Secondly, the value of a report is the analysis, which isnt present here. Both these kids were on a sort of juvenile probation yet they threatened a kid with death, blew up pipe bombs, and were not punished. There was no preventive action taken, said Arrington.