Fitch downgraded BP's credit rating by one notch to AA from AA+ and said it may lower it further if the oil well continued its spread. BP, which is the larges oil producer from Gulf of Mexico, will pay $24 million a day to stop the oil spill from spreading and fix the damage. Fitch is expecting $5 billon clean up costs, thus if the costs exceeded that number this will put further downside pressure on the company's rating.