BLACKSBURG, Va. (AP) -- Virginia state police say they're disappointed that NBC decided to air the video and other material it received from the Virginia Tech gunman.

Colonel Steve Flaherty, the police superintendent, says the material contained little they did not already know. He says he hates that "a lot of people not used to seeing that type of image had to see it."

Cho Seung-Hui mailed the material to NBC in the middle of his rampage Monday. In the video he portrays himself as persecuted and rants about rich kids.

Some victims' relatives, upset with NBC, canceled interviews. However, "Today" show host Meredith Vieira defended the network, saying the decision to air the images "was not taken lightly."