From this story on ABC News:
An offshore oil rig has exploded and burst into flames in the Gulf of Mexico just west of the infamous BP Deepwater Horizon oil spill. Initial reports said that the 13 workers on the rig were accounted for but were floating in the water near the rig. Twelve of the workers are reportedly wearing immersion suits, and one worker is reportedly injured. The U.S. Coast Guard has seven helicopters, two fixed-wing planes and a number of watercraft on the way to the scene. The rig, positioned 80 miles south of Vermillion Bay in Louisiana, is owned by Mariner Energy. It was not immediately known what caused the explosion, but the rig reportedly remained on fire after the explosion. Initial reports suggest that the rig was not actively drilling oil at the time of the incident, but it is unclear whether oil is leaking into the water.