The Dow Jones Industrial Average sank 800 points in a broad sell-off on Wall Street Wednesday after the bond market flashed a warning sign for the first time since 2007 that the economy could be headed for a recession.

The 10-year Treasury yield briefly dropped below the two-year, an ominous signal that has predicted past recessions. Investors have been plowing money into long-term U.S. government bonds for months, sending yields sharply lower, as they anticipate slower economic growth.

On Wednesday:

The S&P 500 fell 85.72 points, or 2.9%, to 2,840.60.

The Dow sank 800.49 points, or 3%, to 25,479.42.

The Nasdaq composite lost 242.42 points, or 3%, to 7,773.94.

The Russell 2000 index of smaller company stocks slid 43.05 points, or 2.8%, to 1,467.52.

For the week:

The S&P 500 is down 78.05 points, or 2.7%.

The Dow is down 808.02 points, or 3.1%.

The Nasdaq is down 185.20 points, or 2.3%.

The Russell 2000 is down 45.52 points, or 3%.

For the year:

The S&P 500 is up 333.75 points, or 13.3%.