The Chicago SUN TIMES reporting exclusively tonight:

"Authorities were investigating whether the gunman who killed 32 people on the Virginia Tech campus in the deadliest shooting rampage in U.S. history was a Chinese man who arrived in the United States last year on a student visa. The 24-year-old man arrived in San Francisco on United Airlines on Aug. 7 on a visa issued in Shanghai, the source said. Investigators have not linked him to any terrorist groups, the source said."

The SUN TIMES goes on to report that bomb threats the school received last week may have been a test by the gunman to see how campus security responded..