Nearly five years after the Columbine Massacre the families of the victims are furious over what they learned Wednesday.
A new report on the killings shows Eric Harris and Dylan Klebold were on the Sheriff's Office radar two years before the shooting spree.
The families were allowed to view the murder weapons, bullet fragments, pipe bombs and knives used in the high school killing spree.
The families are trying to determine whether authorities knew enough about Klebold and Harris to stop them from carrying out their plan.
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