Update: Mariner Energy oil rig explodes in the Gulf, oil spotted in the water

UPDATE: Relief was widespread as the crew of the Mariner platform was safe, and no oil spill was reported, although a Coast Guard officer told Bloomberg News that a one-mile oil sheen from the platform was visible in the water after the fire was reported. The Interior Department's Bureau of Ocean Energy Management, Regulation and Enforcement is investigating the accident.

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An oil platform owned by Houston-based Mariner Energy is on fire 80 miles from the coast of Louisiana in the Gulf of Mexico, but news reports say no explosion occured, despite early reports of a blast.

According to CNN, all 13 workers on the rig have been accounted for, with one injured.

The Coast Guard sent seven helicopters and numerous vessels to the Vermilion oil rig 380, which is 80 miles south of Vermilion Bay and west of the Deepwater Horizon blast that caused the massive oil spill in April.

Authorities say they cannot be certain if oil is leaking from the site or not. In a CNBC interview, Mariner Energy director of investor relations Patrick Cassidy said early indications are that no oil is spilling. Cassidy said the fire happened away from the oil-producing well.

Cassidy also specified that Vermilion 380 is a production platform, not a drilling rig.

The Department of Homeland Security told the Associated Press that the platform was in about 2,500 feet of water, though The New York Times reports the platform was floating in relatively shallow water only 340 feet deep.