The market traded nervously, jerking the Dow Jones industrial average above and below the 13,000 mark throughout the day as investors wrestled with reports about potential trouble at Countrywide Financial Corp. and KKR Financial Holdings LLC.

By late in the day, investors saw little reason to buy beyond the fact that stocks are at bargain prices right now, and the Dow closed down about 170 points. The Standard & Poor's 500 index also dropped sharply, and is now down for the year.

Central banks worldwide have supplied billions of funds to banks over the past week to make cash available for lending and keep interest rates stable amid signs that credit was drying up. On Wednesday, the Fed said it would accept a "repo" of $7 billion, in which it buys that amount in securities from dealers, who then deposit the money into commercial banks.

Still, the Fed has not indicated that it will free up more cash by making an interest rate cut at its Sept. 18 meeting, a move that many on Wall Street believe could stoke a stock recovery. Inflation has been keeping the central bank from lowering rates; the Labor Department said Wednesday its Consumer Price Index rose a mild 0.1 percent in July, as expected, but energy prices remain high.

"Yes, the market would probably move dramatically higher if they made a cut," said Linda Duessel, market strategist at Federated Investors in Pittsburgh. "But I think it's more prudent to allow this correction to continue to unfold. After all, we're in the month of August and coming into September — historically, the weakest months of the year. The market has been in need of a correction."

According to preliminary calculations, the Dow fell 167.45, or 1.29 percent, to 12,861.47, closing below 13,000 for the first time since April 24 and continuing a weeks-long pattern of triple-digit moves. The blue chip index is more than 1,100 points below its record close above 14,000 reached in mid-July.

Broader stock indicators also fell. The S&P 500 index dropped 19.84, or 1.39 percent, to 1,406.70, and the Nasdaq composite index lost 40.29, or 1.61 percent, to 2,458.83.

Bonds rose, moving in the opposite direction as stocks. The yield on the benchmark 10-year Treasury note fell to 4.71 percent from 4.73 percent late Tuesday.

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