Syria is not a major oil producer, but oil traders say the possibility of a wider conflict could interrupt production and shipping routes in the Middle East and cause prices to rise. In recent days, oil prices have risen and receded in accordance with the perceived likelihood of a U.S. military attack.
Prices have not fallen further, traders say, because civil unrest and labor conflicts in Libya, which is a major oil producer, has reduced the country's exports.
"The more fundamental issue of constrained Libyan exports continued unabated," said a report from JBC Energy in Vienna.
In other energy futures trading in New York:
Wholesale gasoline fell 5.3 cents to $2.717 per gallon.
Natural gas rose 6.1 cents to $3.738 per 1,000 cubic feet.
Heating oil fell 5 cents to $3.064 per gallon.
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Pablo Gorondi in Budapest and Pamela Sampson in Bangkok contributed to this report.