The US has said the success of a move by oil giant BP to curb a leak in the Gulf of Mexico is "not clear" and the technique provides "no solution".
It was responding to BP's move to siphon oil from the leaking well head to a tanker on the surface.
A government statement said it would not rest until the leak was permanently sealed and the spill cleaned up.
BP executive Kent Wells earlier said the siphoning process was "working extremely well".
This was the third attempt it had made to insert a long narrow tube into the leaking pipe, using underwater robots.
It is thought that BP's 6in-wide (15cm) tube and stopper could capture more than three-quarters of the leak, although a smaller spill nearby also has to be contained.
Mr Wells said on Sunday at the firm's US headquarters in Houston, Texas, that over the next few days the company planned to slowly increase the amount of oil and gas flowing through the pipe to the tanker.
Commitments
But a joint statement by Secretary of Homeland Security Janet Napolitano and Secretary of the Interior Ken Salazar said the latest technique was "not a solution to the problem and it is not yet clear how successful it may be". It added: "We will not rest until BP permanently seals the well head, the spill is cleaned up, and the communities and natural resources of the Gulf Coast are restored and made whole."
It was the second strong statement to BP by the government officials on the current crisis.
Earlier they sent a letter saying they wanted to be sure BP would honour commitments not to limit costs to a US statutory cap of $75m (£50m).
BP responded by saying it had already made clear its position on paying damages for the disaster.
It said last week the cap was irrelevant and it would settle all legitimate damages claims.
"What they are requesting in the letter is absolutely consistent with all our public statements on the matter," said BP spokesman David Nicholas on Sunday.
Lurking slicks
Earlier, scientists said they had found vast underwater plumes of oil, one 10 miles (16km) long and a mile wide.
XOXO: Newly Seasons DVD Box Set
Detailed DVD Info
Category:
Drama Horror Mystery Thriller
Name:Supernatural
Season:1 2 3 4 5
TV Series Release Date:13 Sep 2005
Aspect Ratio:1.78: 1
Sound Mix: Dolby Digital
Language:English With Removable Subtitles
Format:Support Both NTSC and PAL
Discs:35 pcs
TV Series Info
Leading Role: Jared Padalecki, Jensen Ackles, Jim Beaver, Jeffrey Dean Morgan, Katie Cassidy, Lauren Cohan, Samantha Ferris, Nicki Aycox, Alona Tal, Samantha SmithDirector: Eric Kripke
Plot Summary
When Sam and Dean Winchester were just kids, their mother was horribly murdered in front of their father by something "supernatural". Their lives were never the same again. After their mother's murder, their father took an interest in the supernatural and the unexplained and raised the boys as warriors with skills to fight back against the unknown and protect the innocent. 22 years later, with Sam and Dean grown up, their father suddenly disappears on a suppose routine supernatural hunt. Sam and Dean search for their father and along the way help anyone with a supernatural problem with the help from their dad's journal that contains most of his knowledge about the supernatural that he had accumulated over his 22 years of none-stop obsessive hunting.
2010年5月16日星期日
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