Oil prices continued to drop after Wednesday's 5 percent plunge, as Europe's weakest economies failed to get more help from their central bank.
Benchmark crude on Thursday fell by $1.08 to end the day at $93.87 per barrel in New York. Similar concerns weighed on oil markets Wednesday, pushing the benchmark price to the lowest level since Nov. 7.
Brent crude, which is used to price foreign oil that's imported by many U.S. refineries, lost 65 cents to finish at $103.60 a barrel in London.
Investors had hoped that the European Central Bank would take a bigger role in aiding heavily indebted countries like Greece, Italy and Spain. But the ECB has given no indication that it will do so.
Without more support those countries won't be able to pay their bills without even greater spending cuts, analysts said. That will further reduce energy demand and slow imports of manufactured goods from the U.S., China and elsewhere.
Many traders thought the European financial crisis would be resolved by now. With the situation still in flux, they have decided to close out their positions and lock in whatever profits they've made before the end of the fiscal year, PFGBest analyst Phil Flynn said.
"The market has come to the reality that the European situation won't be tidied up before the end of the year," Flynn said.
Oil prices fell despite a brighter outlook for the U.S. economy and rising stock prices. The government said that applications for unemployment benefits fell last week to the lowest level since May 2008. While manufacturing output fell last month after six straight months of steady gains, a regional report on Thursday showed manufacturing activity is rising this month in the Philadelphia area.
The Energy Department said Thursday that the nation's natural gas supplies dropped by 102 billion cubic feet last week. That was more than analysts expected. The U.S. is still loaded with a surplus of gas, however, and storage levels are more than 10 percent above the five-year average.
At the pump, retail gasoline prices fell half a cent to a national average of $3.259 per gallon, according to AAA, Wright Express and Oil Price Information Service. A gallon of regular is 73 cents cheaper than its 2011 peak near $4 per gallon, but it's still nearly 28 cents higher than the same time last year.
In other energy trading, heating oil slipped by nearly a penny to end at $2.8225 per gallon, and gasoline futures gave up 1.6 cents to finish at $2.4877 a gallon. Natural gas lost less than a penny to end at $3.1270 per 1,000 cubic feet.