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The state police statements thus far are being VERY careful to not state explicitly that the suspected killer in the classroom shootings is the same person as the suspected killer in the dormitory killings. They have a "person of interest," still being questioned apparently even now.
" Mr. Cho had used two handguns, a 9-millimeter and a .22-caliber, to shoot dozens of rounds, leaving even those who survived with multiple bullet wounds, officials said. The guns were bought legally in March and April. Colonel Flaherty said that although one of those guns had been used in the dormitory shooting, investigators were not ready to conclude that the same gunman was responsible for both episodes. But he said there was no evidence of another gunman or an accomplice."
http://www.nytimes.com/2007/04/18/us/18cnd-virginia.html?_r=1&hp&oref=slogin