U.S. stocks slid further on Tuesday, driving the Dow below 11,000 and pushing the benchmark S&P 500 down more than 2 percent, as downgrades of Greek and Portuguese debt fueled fears of contagion, while a grilling of Goldman Sachs on Capitol Hill heightened the likelihood of tough financial reform.

The Dow Jones industrial average <.DJI> dropped 226.80 points, or 2.02 percent, to 10,978.23. The Standard & Poor's 500 Index <.SPX> dropped 27.50 points, or 2.27 percent, to 1,184.55. The Nasdaq Composite Index <.IXIC> dropped 53.62 points, or 2.14 percent, to 2,469.33.

(Reporting by Ellis Mnyandu; Editing by Jan Paschal)