BP has denied claims by one of its partners that its handling of the Gulf of Mexico oil spill amounted to "gross negligence"...BP said it "strongly disagrees" with Anadarko Petroleum, who said BP's behaviour in the run-up to the disaster was "reckless"...BP has faced mounting criticism for its handling of what has become the worst environmental disaster in US history, as the leak continues to spread despite efforts to contain it...James Hackett, chief executive of Anadarko Petroleum, said it was considering "contractual remedies" for what the company has described as BP's "gross negligence or wilful misconduct" over the spill. [also refers to Mitsui]