The Federal Reserve, European Central Bank and three other central banks moved in concert to alleviate a credit squeeze threatening global growth, in the biggest act of international economic cooperation since the Sept. 11 terrorist attacks.

The Fed said in a statement it will make up to $24 billion available to the ECB and Swiss National Bank to increase the supply of dollars in Europe. The Fed also plans four auctions, including two this month that will add as much as $40 billion, to increase cash in the U.S.

Central bankers took the action after interest-rate reductions in the U.S., U.K. and Canada failed to allay concerns that banks will reduce lending, sending the U.S. into recession and hobbling growth abroad. Borrowing costs have climbed as mounting losses on securities linked to subprime mortgages caused lenders to conserve cash. [MORE]