NEW YORK — Stocks of computer chip companies and other winners of the artificial-intelligence boom turned back lower Wednesday. Oil prices, meanwhile, rose another 3% as fighting continues in the war with Iran.

The S&P 500 fell 0.2%, even though most of the stocks within it rose. The Dow Jones Industrial Average was up 89 points, or 0.2%, and the Nasdaq composite was 0.5% lower.

The price for a barrel of Brent crude oil, the international standard, rose 2.6% to $93.40. That’s up from less than $72 early this month, which is roughly where it was before the war with Iran.

Earlier Wednesday morning, it briefly topped $95 per barrel to touch its highest price in nearly six weeks.

Rising oil prices are threatening a reacceleration of inflation, just as increases for prices were slowing more than economists expected. That in turn could push the Federal Reserve and other central banks to raise interest rates, which would slow economies and undercut prices for stocks and other investments.

The yield on the 10-year Treasury remained at 4.63%, where it was late Tuesday. That’s up sharply from its 3.97% before the war with Iran began, and it's already helped bring long-term U.S. mortgage rates to their highest levels in nearly a year.

Oil prices have climbed as fighting across the Middle East keeps oil tankers from using the Strait of Hormuz to exit the Persian Gulf and delivering to customers. Normally, a fifth of all oil and natural gas traded in peacetime passes through the narrow strait.

The auto club AAA said Wednesday that the average price for a gallon of regular gas in the U.S. jumped again overnight to $4.06. That’s still below highs of around $4.56 per gallon in May, but it had been below $3 before the United States and Israel attacked Iran in late February.

In stock markets abroad, indexes climbed in Europe following a mixed session in Asia.

London’s FTSE 100 rose 1.6%, while Hong Kong’s Hang Seng fell 1% for two of the world’s bigger moves.