The U.S. Federal Reserve slashed rates back to near zero, restarted bond buying and joined with other central banks to ensure liquidity in dollar lending to help put a floor under a rapidly disintegrating global economy during the coronavirus pandemic.

And in a dramatic move that underscored the depth of the economic threat as businesses shutter and potentially millions of jobs evaporate, the Fed encouraged banks to tap trillions of dollars in equity and liquid assets built up as capital buffers since the financial crisis to support firms and people whose lives have been upended by the virus.

"The virus is having a profound effect on people across the United States and around the world," Fed Chair Jerome Powell said in a news conference after cutting short-term rates to a target range of 0 percent to 0.25 percent, and announcing at least $700 billion in Treasuries and mortgage-backed securities purchases in coming weeks.