The British oil company, BP, has encountered problems with the containment device it is trying to put over a blown-out well on the seabed of the Gulf of Mexico. Chief operating officer said the 98-tonne concrete-and-steel box had to be moved, after ice-like crystals began accumulating inside it. He said BP's engineers hoped they could find a solution to the problem. The aim is to contain as much as 85% of the escaping oil and then funnel it into a waiting tanker on the surface. Meawhile, US officials have closed the Breton National Wildlife Refuge to the public after the slick caused by the leak reached islands off Louisiana.