A slump in oil prices sparked a global sell-off in financial markets on Friday with losses spreading from Asia to Europe to the U.S., where stocks fell sharply to cap their worst week since the summer. The selling was broad, with all 10 sectors of the Standard and Poor's 500 index ending down.

A slump in oil prices sparked a global sell-off in financial markets on Friday with losses spreading from Asia to Europe to the U.S., where stocks fell sharply to cap their worst week since the summer. The selling was broad, with all 10 sectors of the Standard and Poor's 500 index ending down.

On Friday:

The Dow Jones industrial average lost 309.54 points, or 1.8 percent, to 17,265.21.

The Standard & Poor's 500 index lost 39.86 points, or 1.9 percent, to 2,012.37.

The Nasdaq composite declined 111.71 points, or 2.2 percent, to 4,933.47.

For the week:

The Dow fell 582.42 points, or 3.3 percent.

The S&P 500 fell 79.32 points, or 3.8 percent.

The Nasdaq dropped 208.80 points, or 4.1 percent.

For the year:

The Dow is down 557.86 points, or 3.1 percent.

The S&P is down 46.53 points, or 2.3 percent.

The Nasdaq is up 197.41 points, or 4.2 percent.