Major US stocks indexes tumbled by the biggest amount in six weeks today as investors grew worried that they have been too quick to bet on an economic rebound during the market’s five-month rally.

Wall Street pulled off a big turnaround today, rebounding from a steep early drop to finish modestly higher.

A warning from tech giant Intel about poor business conditions and more evidence of rising unemployment left US stocks with their biggest losses in a month today.

A stock market gaining confidence in the US financial system bolted higher today, propelling the Dow Jones industrials and Standard & Poor’s 500 index to their first four-day advance since last spring.