I think most ppl whose in the market are not putting their mortgage payments to play. That would be dumb.
I do think though that economy as a whole is turning south, which cause the company lower their earning estimates and slower grow outlook. Which in turn making investors dumping the stocks, and choose something more secure investment such as bond, etc.
I think DOW is too high as it is. It's probably brake 12000 by early next week. It might seek bottom near 11000.
Disclosure: I'm not a market analyst or anywhere near it. It just my personal opinion.