The price of oil fell below $108 a barrel Friday as an imminent U.S. attack on Syria appeared less likely.
President Barack Obama says he hasn't made a final decision about a military strike against Syria. But he is considering a limited and narrow action in response to a chemical weapons attack that he says Syria's government carried out last week.
British lawmakers on Thursday voted against going along with Prime Minister David Cameron's plan to intervene in Syria.
U.S. benchmark oil for October delivery fell $1.15, or 1.1 percent, to $107.65 a barrel on the New York Mercantile Exchange Friday.
Brent crude, the benchmark for international crudes, was down 95 cents to $114.10 a barrel on the ICE Futures exchange in London.
"The U.S. is looking increasingly isolated as far as potential attack on Syria," is concerned, said Jim Ritterbusch, president of Ritterbusch & Associates, an independent energy consulting firm.
Still, the surge in prices that pushed oil to a two-year high Wednesday is starting to affect pump prices in the U.S.
Oil has fallen back 4 percent since climbing as high as $112.24 during trading on Wednesday, when an attack on Syria seemed imminent.
But the surge in prices isn't necessarily over Ritterbusch said.
"It's premature to say that we've seen the highs," he said.
Syria is not a major oil producer but a widening conflict there could affect major producers in the region or disrupt supply routes.
The rise in prices may have as much to do with sagging output from Libya as the threat of a strike against Syria, said analyst Olivier Jakob of Petromatrix in Switzerland.
Earlier this week, Libya's deputy oil minister, Omar el-Shakmak, said the country was currently exporting between 300,000 and 320,000 barrels a day, a fifth of the 1.6 million barrels it regularly exported before the 2011 war that overthrew dictator Moammar Gadhafi.
The export drop was due to protests by security guards protecting Libya's oil industry and infrastructure shutdowns.
Jakob said Libya's supply disruption was "a very significant event."
In other energy futures trading on Nymex:
Wholesale gasoline was down 4.1 cents to $2.89 per gallon.
Heating oil lost 5.2 cents to $3.14 per gallon.
Natural gas dropped 3.7 cents to $3.58 per 1,000 cubic feet.
Pamela Sampson in Bangkok contributed to this report.