Police have named a student who shot dead at least 30 people at a US university as Cho Seung-hui, a 23-year-old from South Korea.
He was studying English and had been living on the university campus. He killed himself after the rampage.
Police said a gun found at the scene was also used at an earlier shooting in which two people were killed.
It was the worst school attack in US history. A memorial service is to be held at the university on Tuesday.
US President George Bush and his wife Laura are expected to attend.