The student who shot dead at least 30 at Virginia Tech sent a package to the US TV network NBC News on the day of the shootings, police said.
 | Police interviewed the gunman at length more than a year ago | The package contained "disturbing" photographs, video and writings, NBC said, apparently sent between the two rounds of killings. The correspondence has been turned over to the FBI for examination. A total of 33 people, including the gunman, Cho Seung-hui, died in shootings at two locations on Monday. "This may be a very new, critical component of this investigation," said Col Steve Flaherty, superintendent of the Virginia State Police. "We're in the process right now of attempting to analyze and evaluate its worth," he said. 'Multimedia manifesto' NBC said a time stamp on the package indicated it was sent in the two-hour interval between two killings in a dormitory and a second, massive round of killings in a classroom building. An NBC editor said the package was received on Wednesday. He described it as a long "multimedia manifesto". Two people were killed at the West Ambler Johnston Hall, a university dormitory, at 0715 on Monday. Two hours later Cho killed 30 others, plus himself, at the Norris Hall complex across campus. Authorities have not yet linked the 23-year-old to any of those he killed. Police say the same gun was used at both locations but have not definitely proved that Cho was at West Ambler Johnstone at the time of the shootings there. Police have also revealed that Cho was admitted to a mental health unit in late 2005. He was sent for evaluation after two female students made complaints against him, they said. The complaints were made in November and December 2005, around the time Cho's English teachers raised concerns over his writing and general behaviour. In the aftermath of the shootings, teachers and fellow students have spoken of Cho's moods, violent writings and unpredictable behaviour. | 
Roommate on Cho 
