Lehman Brothers’ US liquidators have asked Barclays to explain what happened to an estimated $3.3bn earmarked for bonuses and other liabilities that the UK bank received when it acquired part of the bankrupt Wall Street company last year.

The move by Bryan Marsal, who heads the firm managing Lehman’s US liquidation, underlines the tension between the company’s creditors and Barclays, which acquired the North American arms of the investment bank for $1.5bn after it filed for bankruptcy in September.