An oil rig, owned by Mariner Energy Inc., exploded in the Gulf of Mexico today. The Coast Guard previously reported a mile-long oil sheen from the burning platform, but the Coast Guard is now “unable to confirm its earlier report that a mile-long oil sheen was spreading from the platform, [but] . . . the platform fire has been extinguished.” The most recent report says the fire “‘wasn’t a blowout, [and] it’s not an explosion.’” Also, the “platform’s seven wells were ‘shut in’ at the time.”