NBC has received material from the Virginia Tech shooter believed to have been sent between the first and second shooting. Following is a statement from NBC news:
NBC received a communication from Cho Seung-Hui, the man identified by police as the Virginia Tech shooter, via the US Mail this morning and immediately turned it over to the authorities. The package included images, videos and writings, and appears to have been mailed between the two shootings. We are cooperating fully with the authorities.
--- Allison Gollust, SVP News Media Relations