The Dow ended the day at its lows, finishing down 678.91, or 7.3 percent, at 8,579.19. T
he blue chips hadn't closed below 9,000 since June 30, 2003, and haven't closed at this level since May 21, 2003.
The Dow's 2,271-point tumble over the last seven sessions is its steepest seven-day point drop ever.
Its seven-day percentage decline of 20.9 percent is the largest since the seven-day plunge ending Oct. 26, 1987, when the Dow lost 23.8 percent.
That sell-off included Black Monday, the Oct. 19, 1987 market crash that saw the Dow fall nearly 23 percent in a single day.
The S&P 500 fell 7.6 percent,
Nasdaq composite index fell 5.5 percent, to 1,645.12.