BP's blown-out well spewed millions of gallons (liters) of oil into the sea, about 50 miles (80 kilometers) southeast of the mouth of the Mississippi River on the east side of the river delta. The crude fouled beaches, marshes and rich seafood grounds.

After Friday's blaze, 11 people were taken by helicopter to area hospitals or for treatment on shore by emergency medical workers.

The production platform is on the western side of the Mississippi River delta. The Coast Guard said more than 20 people were aboard the platform at the time of the fire.

"The company continues to cooperate closely with all state and federal agencies," company officials said in a news release Saturday. "As reported yesterday, this platform was not in operation and had been shut in since mid-August. According to visual reports from this morning, there is no visible sheen in the vicinity of the platform. "

Cubanski said the platform appeared to be structurally sound. He said only about 28 gallons (106 liters) of oil were in the broken line on the platform.

David Smith, a spokesman for the Interior Department's Bureau of Safety and Environmental Enforcement in Washington, said an environmental enforcement team was dispatched from a Gulf Coast base by helicopter soon after the Coast Guard was notified of the emergency. Smith said the team would scan for any evidence of oil spilling and investigate the cause of the explosion.

Black Elk Energy is an independent oil and gas company. The company's website says it holds interests in properties in Texas and Louisiana waters, including 854 wells on 155 platforms.