The student who shot dead at least 30 people at Virginia Tech sent a package to the US TV network NBC News on the day of the shootings, police said.
The package contained "disturbing" photographs, video and writings, NBC said, posted from the college campus between the two rounds of killings.
Cho Seung-hui is shown pointing guns at the camera, and ranting angrily.
A total of 33 people, including the gunman himself, died in shootings at two locations on Monday.
"You had a hundred billion chances and ways to have avoided today," the 23-year-old gunman said angrily, in an excerpt shown on NBC Nightly News.
4 bombs kill 178 in Iraq
By Sinan Salaheddin The Associated Press
Baghdad - Four large bombs exploded in mostly Shiite areas of Baghdad today, killing at least 178 people and wounding scores - the deadliest day in the city since the start of the U.S.-Iraqi campaign to pacify the capital two months ago.
U.S. Defense Secretary Robert Gates called the bombings "horrifying" and accused al-Qaida of being behind them.
In the deadliest of the attacks, a parked car bomb detonated in a crowd of workers at the Sadriyah market in central Baghdad, killing at least 122 people and wounding 148, said Raad Muhsin, an official at Al-Kindi Hospital where the victims were taken. read more »