Cho Sent a 'Multimedia Manifesto' to NBC

That's how anchor Brian Williams describes the package Virginia Tech killer Cho Seung-Hui sent to NBC News after the first two slayings in a university dorm, and before Cho killed 30 more on campus. MSNBC.com says it includes "a written communication, photographs and video."

The package, timestamped in the two-hour window between Monday's shootings, was sent to NBC News head Steve Capus. In an interview with MSNBC.com, Capus said Cho talks to the camera in the videos. In one instance, he makes a vague reference to the massacre, Capus said, and said, "This didn't have to happen."

"The statement is hard to follow, kind of rambling. He speaks about hatred," Capus said, adding that it was "disturbring, very angry, profanity laced." Police said the development might be "a very new, critical component of this investigation." "We're in the process right now of attempting to analyze and evaluate its worth," said Col. Steve Flaherty, superintendent of Virginia State Police.

The network has turned the material over to the FBI, but kept a copy. Williams says NBC is still deciding how to handle the information, and will "go through the material" on its evening news broadcast tonigh