7:15 a.m.
•First 911 call comes to police about shooting at West AmblerJohnston Hall, a dormitory that holds nearly 900 students.Police find two shooting victims: students Ryan Clark andEmily Hilscher. Police question someone about the shooting,but make no arrest.
About 7:30 a.m.
•University authorities begin to consult on their response tothe shootings.
About 9 a.m.
•Classes begin in Norris Hall.
•Cho Seung-Hiu spotted in Norris Hall.
About 9:10 a.m.
•Cho walks into a German class in Norris Hall and,standing about five feet from the door, starts shooting at aprofessor and students. Erin Sheehan survives by pretendingto be dead. Cho leaves the room and returns a few minuteslater, but students bar the door.
•Student Derek O'Dell crouches behind a desk as the killermakes his way through his classroom, shooting at point-blankrange. One bullet hits O'Dell just below his right shoulder,tearing a hole in his jacket. O'Dell feels a "tingling sensation"and doesn't realize he was shot until the ordeal ended.
•Professor Liviu Librescu is leading a Norris Hallengineering class on solid mechanics. When gunshots areheard in the classroom next door on the second floor,Richard Mallalieu and classmates knock out windows andjump, as Librescu holds the door closed.
•Told about a campus shooting, janitor Gene Cole headsto the second floor of Norris to look for a co-worker. He seesa body covered in blood on the floor. Then Cho startsshooting at him from a door about 20 feet away, and he runsdownstairs to safety.
•Zach Petkewicz and classmates in Norris Hall hearshooting and barricade the door to the classroom. Thegunman cracks open the door and when students slam itshut, he shoots twice into the door. Then he turns away andwalks down the hall.
•Chris Roil, a junior from Towson, and other students hearshots as they take an accounting test on the third floor ofNorris.
•Police arrive to find Norris Hall doors chained shut. Theybreak in and head for the second floor.
9:26 a.m.
The university e-mails students about the dormitoryshooting.
9:45 a.m.
•First 911 call from Norris Hall
•Roil and classmates move to an office in Norrisand hear more gunshots.
9:50 a.m.
The university e-mails students that a "gunman is loose oncampus."
About 10 a.m.
•Police find Cho dead of a self-inflicted gunshot.
•SWAT team takes Roil and classmates out of the building.
•Thirty dead students and faculty are found in fourclassrooms on the second floor and in a stairwell.
10:16 a.m.
The university e-mails an announcementthat all classes are canceled.
10:52 a.m.
A university e-mail informs studentsof the shootings at Norris.
Source: Sun reporting, CNN, AP, Roanoke Time and other wire reports