News on this is just trickling in, but apparently there's been another oil platform explosion* off the Louisiana coast. The New Orleans station WDSU reports that the Coast Guard has been called in, and the 13 workers on the rig have been accounted for.
The explosion happened 80 miles south of Vermilion Bay at around 9 a.m., on a rig owned by Mariner Energy. There aren't a whole lot of details yet; will update as they come in.
The Houston Chronicle has more.
* Post has been updated to clarify that it was a platfrom, not a rig, that exploded this morning.