WASHINGTON, D.C. — US banking regulators said on Friday that they had identified weaknesses in the bankruptcy plans of half of America's largest banks, warning this raised questions about their feasibility.

Bank of America, Citigroup, Goldman Sachs and JPMorgan Chase all had a 'shortcoming' in their resolution plans, also known as 'living wills,' which detail their bankruptcy plans in the event of failure or 'material financial distress,' the Federal Reserve (Fed) and the Federal Deposit Insurance Corp. (FDIC) said in a statement.