Brian Rohrbough, whose 15-year-old son Daniel was killed at Columbine, used the anniversary of the massacre to call for release of a videotaped manifesto by Harris and Klebold that has long been sealed by local authorities for fear of encouraging copycats.
Rohrbough said at a news conference that authorities could learn from the manifesto and might even have prevented the slaughter at Virginia Tech.
"When information is uncovered and does not compromise the investigation it should be out there," he said. "I'm encouraged that the authorities in Virginia are being open with what they are learning."
Ari