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APROBERT, La. — Two days after BP began a risky effort to stop a gushing oil well in the Gulf of Mexico, company officials said the operation was going as planned but offered few details, leaving the nation in suspense about whether its worst oil spill would end any time soon. BP PLC warned that it could be Sunday or later before the outcome of its bid to plug the well through an effort known as a "top kill" would succeed.
Experts said they could see incremental progress at best from BP's "spillcam" of mud, gas and oil billowing from the seafloor. The hypnotic video has become an Internet sensation as Americans watch and try to fathom whether BP's efforts are working.
Scientists say the images may offer clues to whether BP is getting the upper hand in its struggle to contain the oil, said Tony Wood, director of the National Spill Control School at Texas A&M University in Corpus Christi. If the stuff coming out of the pipe is jet black, it is mostly oil and BP is losing. If it is whitish, it is mostly gas and BP is also losing.
If it is muddy brown, as it was much of Friday, that may be a sign that BP is starting to win, he said. That "may in fact mean that there's mud coming up and mud coming down as well," which is better than oil coming out, Wood said.
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