CHRIS KAHN

The Associated Press

NEW YORK (AP) -Oil prices surged above $66 a barrel Thursday along with the major global indexes in what has become a very volatile week for energy markets.

With regulators meeting in Washington to consider new limits on speculators that some blame for wild swings in oil and gas prices, crude fell 6 percent Wednesday only to rebound by almost that much Thursday.

Benchmark crude for September delivery rose $3.25 to $66.60 a barrel on the New York Mercantile Exchange. In London, Brent prices rose $3.15 to $69.68 a barrel on the ICE Futures exchange.

Crude prices have recently tracked stock markets closely and that trend continued Thursday. The Dow Jones industrial average surged 173.45 points to 9244.17 in morning trading.

In Japan, carmakers Nissan Motor Co. and Honda Motor Co. jumped 11.1 percent and 8.2 percent on strong profits. In Europe, BT Group PLC rose 12.7 percent and its French peer Alcatel-Lucent SA rose 7.7 percent after they also unveiled better than expected second-quarter earnings.

Two major companies in the petroleum industry, Exxon Mobil and Royal Dutch Shell PLC, reported steep profit drops.

Exxon Mobil said its quarterly profit fell 66 percent, more than expected, from a year ago as crude and gas prices dropped and refining margins tightened. Royal Dutch Shell said its profit for the same period fell 67 percent for similar reasons, and CEO Peter Voser promised to cut jobs and reduce capital spending next year.

Energy demand has evaporated this year, with people driving less, flying less, and energy-intense industries sharply cutting back production and jobs.

Stores of natural gas, which is used to power manufacturers and other heavy industries, continues to grow.

The Energy Information Administration said Thursday that natural gas supplies grew another 71 billion cubic feet last week, putting the country's stockpiles more than 23 percent above last year.

Still, retail gas prices have been building for more than a week as refiners cut back on production. The national average added less than a penny overnight to $2.516 a gallon, according to auto club AAA, Wright Express and Oil Price Information Service. A gallon of regular unleaded gas is 11.7 cents cheaper than a month ago, and it's $1.41 cheaper than the same time last year.

In other Nymex trading, gasoline for August delivery rose 8.05 cents to $1.9355 a gallon and heating oil added 7.83 cents to $1.7496. Natural gas for September delivery climbed 9.6 cents to $3.644 per 1,000 cubic feet.

Associated Press writers Carlo Piovano in London and Alex Kennedy in Singapore contributed to this report.