Anatomy Of A Two-Hour Rampage

Campus Police say moments after two students were killed at West Ambler Johnson, they secured the dorm. But Tuesday, students who live there tell a different story.

Jessica Rudeselli said one hour after the shooting at Ambler she walked right out of the dorm.

"I just walked out," Rudeselli said.

Did anyone say anything to her prior to leaving?

"No," Rudeselli told CBS News correspondent Sharyn Alfonsi. "Everyone else I passed in the hall didn't really say anything."

The dorm was not secure, the gunman was on the loose and students wouldn't be told anything for another two hours.

That allowed Cho Seung-Hui plenty of time to carry out his killings.

Alfonsi and her crew walked from the dorm to the sight of the second shooting — the Norris building. It took nine minutes.

Nine minutes to walk the half-mile, which means Cho could have made the trip more than 13 times in two hours — two hours when thousands of students milled around campus with no idea what already happened.

An official warning didn't come until 9:26 a.m.

University officials sent their first e-mail reporting the shooting and said, simply "be cautious."

Campus police thought the shooting was "domestic," locking down the campus of 25,000 students, stretched over 2,000 acres and 100 buildings didn't make sense.

Don Hennee is a security expert.

"You always have to weigh putting out information if you don't have all the facts, could that create … hysteria," Hennee said.

But at 9:45, Cho Seung-Hui stormed Norris Hall.

Five minutes later, students got another warning "A gunman is loose on campus... Stay in buildings... away from all windows."

But it was too late for more than 30 students. Two hours, too late.

"If they had said something, made a warning, those people probably wouldn't be dead," said Robert Michaels, who works for Virginia Tech.