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SAN FRANCISCO (MarketWatch) -- The U.S. Coast Guard said Friday it is responding to a second oil-rig accident. A "mobile inland drilling unit" with a 20,000-gallon diesel fuel capacity overturned in the Charenton navigational channel south of U.S. Highway 90 near Morgan City, La. No fuel leak or injuries have been reported but 500 feet of containment boom has been deployed around the rig, the Coast Guard said.

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