Gunman in massacre contacted NBC News.

BLACKSBURG, Va. - Sometime after he killed two people in a Virginia university dormitory but before he slaughtered 30 more in a classroom building Monday morning, Cho Seung-Hui sent NBC News a rambling communication and videos about his grievances, the network said Wednesday.

Cho, 23, a senior English major at Virginia Polytechnic Institute and State University, killed 32 people in two separate attacks Monday before taking his own life.

Network officials turned the material over to the FBI and said they would not immediately disclose its contents beyond characterizing the material as “disturbing.” It included a written communication, photographs and video.

Brian Williams, anchor and managing editor of “NBC Nightly News,” said in a posting on the program’s “Daily Nightly” blog that the communication was received earlier Wednesday. He described it as a very long “multi-media manifesto.”