After two huge sell-offs in a row, U.S. stocks were all over the map on Tuesday. Investors blamed the wild moves on a combination of interest-rate fears, computer-driven trading and the obscure volatility funds that use leverage.

The Dow Jones industrial average opened with a big whoosh lower, then rallied all the way back. The Dow closed 567.02 points higher at 24,912.77 and rose as much as 600.48 points. At its session low it was down by 567.01 points. It traded in a range of 1,167.49 points. Dow DuPont was the best performer on the Dow, rising nearly 6 percent.

The S&P 500 ended 1.7 percent higher at 2,695.14 with tech as the best-performing sector. The Nasdaq composite gained 2.1 percent to close at 7,115.88.

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