Stocks opened mostly lower then drifted to the downside in early action Thursday, struggling to find traction despite additional central bank measures, including an expanded European Central Bank asset-buying program and the Federal Reserve's introduction of a backstop for money-market mutual funds and additional dollar swap lines with foreign central banks.

The Dow Jones Industrial Average fell 420 points, or 2.1%, while the S&P 500 was off around 1.7%. The Nasdaq Composite opened in positive territory but was off 0.9% in recent action.

Source : MarketWatch