Stocks have fallen another leg lower so that the S&P 500 now sits at a new two-month low.
Underlying share volume has been robust this session. There are still two full hours before the toll of the closing bell and more than 700 million shares have already traded hands on the New York Stock Exchange. The increase in activity comes as investors juggle their portfolios amid ongoing headline risk related to Japan's nuclear facilities and the political and social tumult in the Middle East and North Africa.