NEW ORLEANS — Two oil workers remained missing at sea Saturday, a day after a torch being used to cut an oil pipe ignited a blaze that severely burned four other workers on a production platform in the Gulf of Mexico.

The four burned workers are in critical but stable condition. Meanwhile, officials said no oil was leaking from the charred platform, a relief for Gulf Coast residents still weary two years after the BP oil spill illustrated the risk offshore drilling poses to the region’s ecosystem and economy.