NBC News received a package from by Cho Seung-Lui, the Virginia Tech student who shot and killed 32 people at the university Monday morning. Cho mailed the package, which contained a video DVD and a written manifesto, between his two shooting attacks.

The videos of Cho were played on NBC Nightly News and MSNBC late Wednesday. Anchor Brian Williams also showed a print-out of the manifesto written by Cho. There were also 29 photos, some showing Cho posing with guns. The DVD disc had about 10 minutes of video files, in which Cho spews several angry rants that included a reference to the Columbine High School shooters. He appears to have filmed the video himself.

NBC News president Steve Capus told MSNBC that the package was flagged by the letter carrier when it arrived at NBC headquarters in New York because of the return address, which read Blacksburg, Virginia, where Virginia Tech is located. It had the name Ishmael instead of Cho. NBC security personnel handled the package and turned its original contents over to FBI officials in New York.

"I think this is inside the mind of a murderer," Capus, who saw the contents of the package around noon on Wednesday. "When you look at some of the writings, these are long ramblings that are very hard to follow. It's laced with profanity all the way through it."

Capus said there was no indication in the letter of why Cho sent the package to NBC.

Brian Williams said the address was not mailed to anyone in particular at NBC. An incorrect address likely held up the delivery of the package. - Reporting by Stephen Battaglio

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Also see: "NBC Gets 'Disturbing' Package from Virginia Tech Shooter."