Oil major BP Plc is seeking a strategic investor to secure its independence in the face of any takeover attempts as it struggles with a devastating oil leak in the Gulf of Mexico, newspapers said on Sunday.

Britain's Sunday Times said the company's advisers were trying to drum up interest among rival oil groups and sovereign wealth funds to take a stake of between 5 and 10 percent in the company at a cost of up to 6 billion pounds ($9.1 billion).

Abu Dhabi newspaper The National said BP could get a reprieve from Middle East financial institutions looking to make a strategic investment, citing informed sources.

Proposals from the region have already been submitted to BP advisers in London, the newspaper reported, and could involve Middle Eastern investors purchasing key assets from BP, which has lost more than half its market value since an explosion at the Deepwater Horizon rig on April 20 started the still-gushing leak.

The paper said regional financial institutions might also give financial backing to any capital-raising BP might be considering to reinforce its balance sheet following the environmental disaster, which could cost as much as $60 billion to clean up.

The report did not indicate which Middle Eastern financial firms issued the proposals or what the size of investments could be.

Regional sovereign wealth funds, such as the Qatar Investment Authority (QIA) and Abu Dhabi Investment Authority (ADIA), have supported Western companies in times of financial crisis by purchasing stakes in western banks and effectively halting declines in their share prices.

Separately, British newspaper the Guardian said BP was holding talks with the Kuwait Investment Office about raising its 1.75 percent stake in the oil company to potentially as much as 10 percent.

Rival oil majors ExxonMobil, Total and Royal Dutch Shell have been mooted as possible bidders.

BP declined to comment on the speculation.

The New York Times reported on Sunday that BP is asking its partners in the ruptured well, Anadarko Petroleum Corp and Mitsui Oil Exploration Co, to contribute nearly $400 million to the clean-up effort.

BP sent out demands for $272 million from Anadarko and $111 million from Japanese company Mitsui on June 2. That represents roughly 40 percent of the $1 billion BP spent in May, according to the newspaper.

BP owns 65 percent of the well, Anadarko owns 25 percent and Mitsui 10 percent.

We have said that other parties besides BP may be responsible for costs and liabilities arising from this oil spill and we expect those parties to live up to their expectations, BP spokesman Toby Odone said in Houston.

Anadarko and Mitsui did not immediately respond to calls for comment.

Meanwhile, the Sunday Telegraph reported BP was facing fresh criticism over its approach to safety as it emerged it did not use an industry standard process, known as a safety case, to assess risk at the Deepwater Horizon rig.

A BP spokeswoman confirmed to Reuters that it did not use the procedure, developed in Britain after the Piper Alpha oil rig explosion in 1988, at any of its U.S. wells as there was no legal requirement in the U.S. to use it.

BP shares closed down at 322 pence in London on Friday, valuing the business at 60.5 billion pounds.

(Reporting by Matt Scuffham and Shaheen Pasha; Additional reporting by Caroline Copley; Editing by Will Waterman and Todd Eastham)