BP has increased the amount it is looking to rake in from asset sales to $40bn, or £26bn, as rumours do the rounds it will offload its stake in the Prudhoe Bay field.The company, which needs the cash to pay for the Gulf of Mexico oil slick, wants $20bn (£13bn) for its 26% interest in the lucrative Alaskan field, the largest in North America, according to reports.It had originally flagged plans to raise $30bn (£20bn) and has already agreed to sell assets worth about £6.5bn.Talks are also apparently taking place concerning the sale of overseas projects worth $5bn-10bn, including a number of North Sea oilfields, to its Russian joint venture TNK-BP.The reports come as the US cost guard overseeing the clean-up operation says the broken well no longer presents a risk to the environment.It "does not constitute a threat to the Gulf of Mexico," Admiral Thad Allen told reporters ahead of a key internal report on the disaster due within ten days.BP yesterday recovered the blow-out preventer from the seabed as its investigation into the causes of the Macondo well catastrophe nears a conclusion. The failure of the blow-out preventer led to the explosion on the Deepwater Horizon oil rig that killed eleven people. It has passed the blow-out preventer to the US Joint Federal Marine Board and other US agencies independently examining the causes of the spill.