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US stocks rebounded after nearing oversold territory this week, Treasury yields fell while Federal Reserve Chair Jerome Powell sidestepped investor concerns over the outlook for interest rates at an event.
A major crude storage hub in the US is running low on stockpiles at a time when world markets are feeling a supply squeeze.
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U.S. investors are in the grip of "extreme fear" for the first time in six months, according to CNN's widely quoted "Fear and Greed" index.