Dick Fuld, Lehman Brothers’ chief executive, broke his silence on the collapse of his bank by telling a congressional committee on Monday that he would go to his grave wondering why the US government opted to save AIG but allowed Lehman to fail.

Three weeks after the 158-year-old firm sought bankruptcy protection – the largest such filing in US history – Mr Fuld blamed Lehman’s collapse on a plague of naked short selling, and said in response to a question that he had no idea why US regulators would judge his company unworthy of a federal bail-out.