Trees are tied with ribbons of Virgina T...

Blacksburg, UNITED STATES: Trees are tied with ribbons of Virgina Tech school colors, orange and crimson 20 April, 2007 on the campus of Virginia Tech University in Blacksburg, Virginia. Bells were set to toll in the United States Friday marking a day of mourning for 32 students and teachers shot dead on a university campus by a deranged student. The day of religious services and commemorations comes amid burning questions over how South Korea-born Cho Seung-Hui, who had been diagnosed with mental problems, was able to buy two guns and ammunition, and continue his studies unchecked at Virginia Tech. In a nation still healing from the September 11, 2001 attacks, Monday's killing spree at Virginia Tech was also written into the annals of US history becoming the country's deadliest school shooting since the Columbine massacre. AFP PHOTO / TIM SLOAN (Photo credit should read TIM SLOAN/AFP via Getty Images)