An oil spill from a stranded tanker off the coast of Oman now covers an estimated 500 square miles, the environmental organization Greenpeace told CNN, prompting fears that a major

An oil spill from a stranded tanker off the coast of Oman now covers an estimated 500 square miles, the environmental organization Greenpeace told CNN, prompting fears that a major ecological disaster could be unfolding in the Arabian Sea.