The price of oil is rising the most in two months after tensions rose between Syria and Turkey.
Oil rose to $91.63, a jump of $3.49, or 4 percent, in morning trading on the New York Mercantile Exchange.
Thursday's rise follows a decline of 4 percent on Wednesday.
The increase came as Turkey's military fired on targets in Syria for the second day. Prices also got a boost from a falling dollar, which tends to influence investors to buy commodities like oil and gold.
The price of gasoline at the pump rose two-tenths of a cent, to $3.784 for a gallon of regular, according to AAA. That's up 38 cents from a year ago.
Brent crude, which is used to price international varieties of oil, was up $3.34 to $111.55 in London.
In other energy futures trading in New York:
— Natural gas rose 0.3 cent to $3.42 per 1,000 cubic feet. It had slightly larger gains earlier in the morning, but gave them up when a government report showed that more gas went into storage last week than analysts had expected.
— Heating oil advanced 9 cents to $3.16 per gallon.
— Wholesale gasoline rose 11 cents to $2.91 per gallon after reports of a fire at an Exxon Mobil Corp. refinery.