22:08 US Fed chair says will take successor 'at his word' on maintaining ...
21:50 US Fed chief stresses need for central bank that is 'free of political ...
21:49 US Fed chief says encouraged that Justice Department dropping probe
21:46 Putin warned US against new military action in Iran in Trump call: Kremlin
21:40 US Fed chief plans to stay on as 'low profile' central bank governor