Columbine Investigation

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Some of the parents who lost their children in the 1999 Columbine High School killings are stunned over a report from the Colorado attorney general.

They say they're disappointed no one will be held accountable for missing possible warning signs about what the two student gunmen were planning to do.

Judy Brown burst into tears when the attorney general didn't blame the local sheriff's office.

She and her husband said they'd repeatedly sought police intervention two years earlier, when one of the teens allegedly made death threats against her son.

Other parents are alleging a police cover-up.