Clerks relay trades from the S&P 500 futures pit at the Chicago Mercantile Exchange on Wednesday. (Above) A German trader rubs his eyes in front of the board of the DAX index which fell below key support levels on Wednesday.US stocks got bloodied this week, with the blue-chip Dow index sinking below to a new two-year low amid unrelenting selling from investors worried about the soft US economy. Agencies via Xinhua