[UPDATED] Rescue efforts are underway after another oil rig explosion in the Gulf of Mexico. CNN is reporting that 13 workers involved in the explosion of Vermilion Rig 380 80 miles south of Vermilion Bay have been found; one is injured. The rig is owned by Houston’s Mariner Energy.

The rig is on fire, but according to WWL.com, the well wasn’t active.

4 p.m.

Reuters says that the fire does not represent an oil spill:

“It wasn’t a blowout, it’s not an explosion,” spokesman Patrick Cassidy told Reuters. “The fire appears to have been in or near the living quarters on the upper deck.”

Still, the Wall Street Journal reports:

Petty Officer Matthew Masaschi told MarketWatch that Mariner Energy(ME 22.70, -0.05, -0.22%) reported seeing a sheen roughly 100 feet wide and 1 mile long. The company had initially reported that there was no oil emanating from the stricken rig, which sits roughly 100 miles off the south-central Louisiana coast area of Vermillion Bay.

It is unclear whether the sheen is an indication of a well leak or spilled petroleum from on board the platform. A Mariner Energy spokesman wasn’t available for comment.

According to CNN.com:

The company said an initial flyover of the site indicated “no hydrocarbon spill.”

However, Coast Guard Petty Officer Elizabeth Bordelon said there is a sheen on the water at the site of the platform, measuring about 100 feet wide and stretching for one mile. Jindal said the sheen can’t be confirmed.

The story went on to say:

“Mariner Energy recently told us that they shut in the production platform, I want to stress that neither the state nor the U.S. Coast Guard have verified that information at this time,” said Jindal. “We are working with the Coast Guard to ensure that the platform is indeed shut in and not leaking anything into the water.”

Jindal said that Mariner has told him that all seven wells have been closed off and that what is burning now is from fuel in storage, and not from an active leak.

The Los Angeles Times reports that the fire has already strengthened support for President Obama’s moratorium on deepwater drilling in the Gulf of Mexico, even though the burning oil platform is in only 340 feet of water.