By Sue Chang
SAN FRANCISCO (MarketWatch) -- An offshore oil rig in the Gulf of Mexico has exploded with at least one person reported missing so far, according to media reports Thursday. The rig is located 80 miles south of the Vermillion Bay in the Louisiana coast and is to the west of the oil rig blast in April. About 12 people are said to be in the water although their condition is not known yet, according to CNN. The rig is owned by Mariner Energy (ME 22.49, -0.86, -3.68%) , the network said. Shares of Mariner Energy are down 4.4% to $22.32 in recent activity.
