Here's a general run-down of what I've been told (as-is, with no guarantees on accuracy):
1. Around 7:15, the shooter goes to a dorm, shoots one person and the police are called.
2. The campus is put into lock down.
3. The police apprehend someone fitting the description of the shooter (Asian, wearing a hat, etc...).
4. The lock down is canceled, as it is believed the shooter has been caught.
5. Within 10 minutes, the actual shooter shows up to a classroom in the engineering building and starts shooting.
6. Every single person in this initial room was shot. The shooter then leaves the room, and those who are able to walk go close the door and barricade themselves against it. At this point the shooter tries to get back in the room, but can't open the door, so he shoots through it. (This was relayed to me by a co-worker who says she talked to someone who was actually in the room.)
7. ? (Haven't heard anything about afterwards)
Interesting Links: http://news.bbc.co.uk/2/hi/talking_point/6561733.stm
As to how a shooter could wander around campus, keep in mind it's a large campus. The college I went to (James Madison University) has 17.4k students, and a campus of ~665 acres . VA Tech has ~28k students, with a campus of ~2600 acres and over 100 buildings. Its student body is 1.6 times bigger than my university, but has a campus 3.9 times bigger. I doubt it's terribly hard to not stand out, considering the shooter was supposed to have had 2 semi-automatic 9mm's and a 22.This comment was edited on Apr 16, 17:58.