Yellen drives global stocks rally

Global stock markets powered higher Wednesday after Federal Reserve boss Janet Yellen hinted that the US central bank would not lift interest rates any time soon. Wall Street rallied overnight after Yellen offered a more dovish outlook than expected on monetary policy, in her first public remarks since the Fed's March meeting. The news sent Hong Kong and Shanghai equities soaring on Wednesday, but Tokyo fell on the back of a stronger yen which hurts exporters.