NEW YORK (CNNMoney.com) -- BP's debt rating, a key indication of the corporate world's outlook for the company, was downgraded Thursday by two of the three major credit ratings agencies for the failure to plug a massive oil leak in the Gulf of Mexico.
Fitch Ratings downgraded two key BP debt ratings to "AA" from "AA-plus" and placed the company on watch for further cuts. Later in the morning, Moody's Investors Service also cut its ratings on two of the oil giant's corporate bonds, to a lower investment grade level.
Fitch, a rating agency headquartered in New York and London, said the economic and environmental damage from the sunken Deepwater Horizon rig is expected to continue, and the leak is unlikely to be plugged any time soon.
The agency estimated that BP's cleanup costs could total $2 billion to $3 billion in 2010 "depending on how much oil reaches the U.S. shoreline."
"The company has so far repeatedly failed to stop the oil leak and has instead reverted to containment methods that are yet to be fully implemented and are subject to potential weather-related disruption," said Fitch, in a written statement.
Moody's also cited the significant containment, clean-up and litigation costs BP faces related to the Gulf Oil spill as reasons for its downgrade of the company's debt.
"Moody's expects these costs to weigh significantly on BP's free cash flow generating capacity and to constrain its ability to focus on other key areas of the company's business in the near to intermediate term," the ratings agency said in a statement.
Fitch said "the drilling of relief wells also poses risks and additional time may be required for them to be fully effective." A criminal and civil investigation announced Tuesday by Attorney General Eric Holder puts further pressure on BP, the rating agency said.
As a result, said Fitch, "risks to both BP's business and financial profile continue to increase."
After the Fitch downgrade early Thursday morning, BP spokesman Mark Salt said the cut "reflects the uncertainty concerning the potential impacts of the oil spill" but that the AA rating "is still a very strong rating."
"We look to maintain a strong balance sheet as set out in our financial framework," said Salt. "We regard the framework as prudent and have no plans to change it."
Another BP spokesman, Toby Odone, said his company has "very strong and ongoing operating performance" and that it remains "one of the strongest companies, with huge cash generation."
The Deepwater Horizon rig that exploded and sank off the Louisiana coast in April, killing 11 workers, is 65% owned by BP. Originating from the ocean floor nearly a mile below the surface, the leak is spilling up to 19,000 barrels per day into the Gulf.
Since the April 20 accident, BP (BP) shares have plummeted more than 40%.
In its most recent press release, BP said it would fund the estimated $360 million cost of building six "sections" to protect Louisiana's barrier islands from the oil spill. This is in addition to providing $170 million to Louisiana, Alabama, Mississippi and Florida to help cover response costs and promote their tourism industries, said BP.
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