• Police ID shooter as 23-year-old resident alien, English major
• Police say one of the guns recovered was used in both shooting incidents
• At least two professors among the dead in Virginia Tech massacre
• Officials: 33 dead, including gunman, in Norris Hall and dormitory shootings
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BLACKSBURG, Virginia (CNN) -- The gunman who killed 30 people at Virginia Tech's Norris Hall before turning the gun on himself was student Cho Seung-hui, university police Chief Wendell Flinchum said Tuesday.
University officials said they were still trying to determine whether Cho was responsible for an earlier shooting at a dormitory that left two dead.
However, Flinchum said ballistics tests show that one of the two guns recovered at Norris Hall was used at Norris and at the dorm, both located on the 26,000-student campus. (Watch police disclose new information about the shooter )
Authorities are still investigating whether Cho had any accomplices in planning or executing Monday's rampage, Col. Steven Flaherty of the Virginia State Police said.
"It certainly is reasonable for us to assume that Cho was the shooter in both places, but we don't have the evidence to take us there at this particular point in time," Flaherty said.
Cho, a 23-year-old South Korean and resident alien, lived at the university's Harper Hall, Flinchum said. He was an English major, the chief said.
Cho was a loner and authorities are having a hard time finding information about him, said Larry Hincker, associate vice president for university relations.
A department of Homeland Security official said Cho came to the United States in 1992, through Detroit, Michigan. He had lawful permanent residence, via his parents, and renewed his green card in October 2003, the official said.
His residence was listed as Centreville, Virginia, a suburb of Washington, D.C.
The university and police are still in the process of releasing the names of the 32 people killed in Monday's shootings. (Watch how some are asking why warnings weren't issued sooner )
"What went on during that incident certainly caused tremendous chaos and panic in Norris Hall," Flaherty said, describing how victims were found in four classrooms and in the stairwell of the school's engineering science and mechanics building.
