Update from 2:23 p.m. EDT

Oil prices closed higher Monday on concerns about a new and growing tropical storm in the Caribbean, a refinery fire in Texas, and reports of a weekend bombing in the heart of Iran's oil industry.

The price of light, sweet crude for November delivery closed up $1.73 to $64.36 a barrel. Heating fuel finished up 3.3 cents to about $1.98 a gallon. Gasoline rose 6.7 cents to $1.81 a gallon and natural gas futures rose 63 cents to $13.85 per million British thermal units.

New storm activity in the Caribbean has the market jittery. The National Hurricane Center said Tropical Storm Wilma was growing stronger and could become a hurricane by tomorrow. Wilma is the 21st named storm of the year, tying 1933 as the busiest hurricane season since records began in 1851.

At 2 p.m. EDT, the center of the storm was 235 miles south-southeast of Grand Cayman. Wilma has drifted southward over the past few hours and it is expected to gradually turn west over the next 24 hours. Maximum sustained winds are 45 mph.

The warnings follow the double blasts from Hurricanes Katrina and Rita that severely damaged Gulf of Mexico energy infrastructure. The U.S. Minerals Management Service said that Monday's shut-in oil production for the Gulf of Mexico was 996,291 barrels oil per day, the equivalent to 66.4% of the gulf's daily oil production. The shut-in gas production is 5.498 billion cubic feet per day, or the equivalent of nearly 55% of the gulf's daily gas production.

A fire broke out Sunday as workers were restarting the Lyondell-Citgo gasoline production refinery back online after a shutdown by Hurricane Rita, a company spokesman said. The cause of the fire has not been determined, said Lyondell-Citgo spokesman David Harpole, who could not say when the unit would be restarted. One employee suffered minor burns. The Houston facility is jointly owned by Lyondell Chemical ( LYO)and Citgo.

"This reminds everyone how tenuous the refinery situation still is," said Phil Flynn, senior market analyst at Alaron Trading. "I just have a feeling that right now we will start trying to search for a bottom. I don't think we're necessarily there, but I think we're down close."

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