LACKSBURG, Virginia (CNN) -- At least 33 people, including a gunman, were killed Monday during shootings in a dorm and a building housing classrooms at Virginia Tech, university officials said.
The death toll makes the incident the deadliest school attack in U.S. history.
Two people were killed at a dormitory about 7:15 a.m., while another 30 people were killed two hours later at Norris Hall, the engineering science and mechanics building, university officials said.
Though university police Chief Wendell Flinchum said police were still investigating whether the two incidents were related, he also said the gunman at Norris Hall took his own life. Investigators are not ruling out a second shooter, Flinchum said.
