Online reports that Bank of America said central banks have been selling U.S. Treasury bonds since March, indicating that they are diversifying their holdings of U.S. dollar assets. In the week ending June 11, U.S. Treasury bonds held by central banks and other official institutions around the world at the Federal Reserve Bank of New York fell by an average of $17 billion, and the decline since the end of March has widened to $48 billion. In addition, foreign holdings of the Federal Reserve's reverse repo instrument have also dropped by about $15 billion since the end of March.