LONDON ( TheStreet) -- BP's ( BP) talks to sell half its stake in Alaska's Prudhoe Bay oil field to Apache ( APA) stalled twice over the weekend, Bloomberg reports. Talks between BP and Apache faltered late in the evening on Friday before resuming Saturday, Bloomberg reports, citing a person with knowledge of the matter. The talks hit a snag again early Sunday over issues ranging from the valuation of the deal to how current and future legal liabilities will be addressed. BP, Apache and their advisers, Bloomberg says, will likely reach out to each other again before letting the deal lapse, this person said. The companies last week were close to an agreement for Apache to buy half of BP's Prudhoe stake for between $10 billion and $11 billion in an all-cash transaction, Bloomberg reports. -- Written by Joseph Woelfel in New York. Get more stock ideas and investing advice on our sister site, Stockpickr.com.