WASHINGTON – The Federal Reserve launched a controversial new policy yesterday, committing to buy $600 billion more in government bonds by the middle of next year in an attempt to breathe life into a struggling U.S. economy.

The decision, which takes the Fed into largely uncharted waters, is aimed at further lowering borrowing costs for consumers and businesses still suffering in the aftermath of the worst recession since the Great Depression.

The U.S. central bank said it would buy about $75 billion in longer-term Treasury bonds per month. It said it would regularly review the pace and size of the program and adjust it as needed depending on the path of the recovery.