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A week ago, the company tried to put a massive box over the leak, but icelike crystals formed and BP scrapped that plan.
BP is also drilling a relief well that is considered the permanent solution to stopping the leak. It's about halfway done and still months away from being completed. The company also is still considering using a smaller containment dome known as a "top hat," as well as a "junk shot," in which golf balls and rubber would be inserted to try to clog the leak.
Meanwhile, BP began spraying undersea dispersants at that leak site and said the chemicals appear to have reduced the amount of surface oil.
Federal regulators on Friday approved the underwater use of the chemicals, which act like a detergent to break the oil into small globules and allow it to disperse more quickly into the water or air before it comes ashore.
The decision by the Environmental Protection Agency angered state officials and fishermen, who complained that regulators ignored their concerns about the effects on the environment and fish.
"The EPA is conducting a giant experiment with our most productive fisheries by approving the use of these powerful chemicals on a massive, unprecedented scale," John Williams, executive director of the Southern Shrimp Alliance, said in a news release.
Louisiana Health and Hospitals Secretary Alan Levine sent a letter to BP outlining similar concerns, but the company and the Coast Guard said several tests were done before approval was given.
"We didn't cross this threshold lightly," Coast Guard Rear Adm. Mary Landry said. "This is a tool that will be analyzed and monitored."
On Friday, President Barack Obama assailed oil drillers and his own administration as he ordered extra scrutiny of drilling permits. He condemned the shifting of blame by oil executives and denounced a "cozy relationship" between the companies and the federal government.