“The boats and the aircraft on scene cannot see a sheen,” U.S. Coast Guard Captain Peter Troedsson told a news conference in New Orleans.

Initially, Mariner reported there was a mile-long oily sheen on the water around the platform, according to the government.

The fire burned for several hours before it was extinguished. A company spokesman said it started on an upper deck of the platform where living quarters were located, and had not been caused by a “blowout,” or sudden release of oil and gas from a well.