NEW YORK (Reuters) - Wall Street plummeted on Thursday as investors reacted to renewed fears of a pandemic resurgence and digested dour economic forecasts from the U.S. Federal Reserve. All three major U.S. stock indexes were down about 5%, posting their worst day since mid-March, when markets were sent into freefall by the abrupt economic lockdowns put in place to contain the pandemic. The Nasdaq snapped a three-day streak of record closing highs. The sell-off was broad, with all 11 major sectors of the S&P 500 falling 3% or more.