Walter said:While that's the obvious lead on motive, I wouldn't buy that as the complete story just yet.
And Shanghai? Huh? That's news to me. Where'd you read it?
I am not sure about how reliable this is, but it has been quoted by a few news articles and in another forum.
http://www.suntimes.com/news/nation/343354,vatech041607.articleprint
Mentions that the man has a visa issued from Shanghai, which most likely mean that he lives around there. Then again, some sources in the Wikipedia article about this are claiming that he is of East Asian decent, with no specific details in terms of country of origin.
I guess we have to wait a couple of days to see how things really are.