Warren Buffett, chairman of Berkshire Hathaway, is on the lookout for big acquisitions. His comments to shareholders at the weekend suggest the company could spend more than $30bn (£16.1bn) over the next three years.

Mr Buffett told a crowd of 24,000 gathered in Omaha, Nebraska for the company's annual shareholders' meeting on Saturday that he was working on one "low probability" acquisition worth as much as $15bn.