NEW YORK — Wall Street has turned the clock back to 1997.

Investors unable to extinguish their worries about a recession that has no end in sight dumped stocks again yesterday. The Dow Jones industrial average tumbled 251 points to its lowest close since May 7, 1997, while the Standard & Poor's 500 index logged its lowest finish since April 11, 1997. It's as if the decade's dot-com surge, collapse and subsequent recovery never occurred.

The Dow is at 7,114.78 points; both indexes have lost about half their value since hitting record highs in October 2007.

"People left and right are throwing in the towel," said Keith Springer, president of Capital Financial Advisory Services.

Investors pounded most financial stocks even as government agencies led by the Treasury Department said they would launch a revamped bank rescue program this week. The plan includes the option of increasing government ownership in financial institutions without having to pour more taxpayer money into them.

"The biggest thing I see here is the incredible pessimism," Springer said. "The government is doing a lousy job of alleviating fears."

The Treasury and other agencies issued a statement after The Wall Street Journal reported Citigroup is in talks for the government to boost its stake in the bank to as much as 40 percent.