oil rig explosion

Another oil rig explosion in the Gulf of Mexico Thursday gave fresh urgency to the debate over the Obama administration's moratorium on deepwater oil drilling. Environmental groups renewed their calls to maintain or expand the ban; advocates for removing it were more circumspect.

Still reeling from the devastation caused by the BP's Deepwater Horizon rig disaster, the U.S. once again got a scare on Thursday as the Coast Guard responded to a rig explosion in the Gulf of Mexico.