* Gasoline, heating oil surge after Baytown, Texas refinery fire
* Middle East tensions, Turkey strikes at Syria lift oil
* Coming up: U.S. Sept. nonfarm payrolls 8:30 a.m. EDT Friday
(Updates throughout) By Robert Gibbons
NEW YORK, Oct 4 (Reuters) - Oil prices jumped 4 percent on T hursday as inflamed Middle East tensions stoked supply fears and U.S. gasoline futures rallied following a fire at the largest operating refinery in the United States.
Brent crude saw the biggest percentage gains since late June as news of the refinery fire at the diesel hydrotreater unit at Exxon Mobil's Baytown, Texas, refinery sent RBOB gasoline futures up more than 5 percent at times in afternoon trade.
Further support for oil came from U.S. equities gains after weekly jobless claims data suggested improvement in the labor market ahead of the monthly nonfarm payrolls report to be released on Friday.
In the most serious cross-border escalation of the 18-month uprising in Syria, Turkey stepped up retaliatory artillery strikes on a Syrian border town after what it called "the last straw" when a mortar hit Akcakale, killing a mother, her three children and a female relative.
The market had been on edge about possible disruptions to supplies from the oil-rich region due to the standoff between the West and Tehran over Iran's nuclear program.
"You have the Middle East and the euro strong against the weaker dollar because people think Europe may yet get a handle on their debt crisis," said Phil Flynn, analyst at Price Futures Group in Chicago.
"Gasoline and heating oil are stronger because of the refinery fire."
The euro hit a two-week high against the greenback, giving a boost to dollar denominated commodities, after European Central Bank President Mario Draghi affirmed his commitment to preserve the region's monetary system and its currency.
Brent November crude rose $4.41 to settle at $112.58 a barrel, snapping three days of losses that had pushed prices to just above $108 a barrel.
U.S. November crude gained $3.57 to settle at $91.71 a barrel, ending a two-session string of losses.
The oil complex was led by U.S. RBOB gasoline, which shot up 14.34 cents to settle at $2.9429 a gallon.
U.S. heating oil , the benchmark distillate contract, pushed 12.20 cents higher to settle at $3.1884 a gallon.
Cash gasoline and diesel prices on the Gulf Coast also surged on news of the Baytown refinery fire.
U.S. stocks on Wall Street and industrial commodities posted broad gains, lifted by data showing that U.S. jobless claims rose but less than expected.
Investors were also awaiting Friday's key U.S. September nonfarm payrolls report for signs of improvement, which could in turn lead to an increase in demand for petroleum and consumer goods.
<^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ FACTBOX on Exxon's Baytown refinery: Graphic - Euro zone growth: Graphic - ECB: Graphic - oil in euros: Graphic - Assets in 2012: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^> REFINERY FIRES
With U.S. product inventories tightening and the winter heating season looming, traders keenly monitored developments at Exxon's massive 560,500-barrel per day Baytown complex.
The company said Wednesday's fire had impacted production but that the problems had been contained in one processing unit which sources familiar with refinery operations said was a diesel hydrotreater.
Support also came from news that a smaller, 130,000-bpd Saratov refinery in Russia also caught fire on Thursday.
(Additional reporting by Matthew Robinson in New York, Alice Baghdjian in London and Ramya Venugopal in Singapore; Editing by Marguerita Choy, Alden Bentley and Jim Marshall)
Keywords: MARKETS OIL/