"fiscal cliff," with declines accelerating at the end of the day on reports that President Barack Obama wouldn't make a new budget proposal in a meeting with congressional leaders.
The Dow Jones industrial average fell 158.20, or 1.2 percent, to 12,928.11.
The Standard & Poor's 500 fell 15.67, or 1.1 percent, to 1,402.43.
The Nasdaq composite index fell 25.59, or 0.9 percent, to 2,960.31.
For the week:
The Dow is down 252.73, or 1.9 percent.
The S&P 500 is down 27.72, or 1.9 percent.
The Nasdaq is down 60.70, or 2 percent.
For the year:
The Dow is up 720.55, or 5.9 percent.
The S&P 500 is up 144.83, or 11.5 percent.
The Nasdaq is up 355.16, or 13.6 percent.