South Korea's Foreign Ministry says the country's "in shock beyond description" after learning the Virginia Tech shooter is a South Korean native.
A foreign ministry spokesman says South Korean diplomats are traveling to Virginia Tech.
The gunman has been identified as 23-year-old Cho Seung-hui. A ministry official says he's been in the U.S. since 1992.
He was a senior and an English major. He lived in a dorm on campus. An official with Homeland Security says Cho was a permanent legal resident of the U.S.
Cho committed suicide after the attacks, the first at a dorm on campus, the second inside a classroom building, killing at least 30 people. No word yet on a motive.
Law enforcement officials say his fingerprints were found on the guns used in both shootings. The serial numbers on the two weapons had been filed off.
One shooting victim says Cho fired away in silence with "no specific target, just taking out anybody he could."
Meanwhile, President Bush has ordered flags to be flown at half-staff in honor of those killed. Flags will remain in the lowered position through sunset on Sunday.
Bush is scheduled to speak at a memorial service on the campus Tuesday. White House spokeswoman Dana Perino says the president and Mrs. Bush will attend the convocation "as representatives of the nation."
She says Bush will speak for about five minutes, remarking about the "amazing strength" of not only the Virginia campus, but the country as a whole.
Virginia Gov. Tim Kaine will travel to the convocation with the president on Air Force One. Kaine has just returned from a trip to Japan to deal with the tragedy.
Students Say Professor’s Sacrifice Saved Lives
E-mails to the widow of an Israeli engineering professor killed in Monday's shootings at Virginia Tech describe how Liviu Librescu blocked the doorway of his classroom with his body and asked students to flee. They started opening windows and jumping out.
Also among the victims was a 51-year-old engineering professor from India. His brother says their elderly parents have completely broken down. He says "it was like an electric shock. We've totally collapsed."