Dow plunges 318 points; drops 3.5% for the week

The Dow had its second straight day of triple-digit declines and its fourth straight session of losses. The blue-chip index dropped 3.5% for the week.

And the tech-laden Nasdaq composite index was off 90.70 points, 2.2%, to 4,128.17. It fell 1.7% for the week.

On Thursday, the Argentine peso plunged 15% versus the U.S. dollar, its biggest swoon since 2002. Similarly the Turkish lira hit a record low vs. the U.S. greenback.

usatoday Dow plunges 318 points; drops 3.5% for the week