(Close): Shares in London recorded the biggest one-day fall of the year, hit by sharp losses for energy firms.
The FTSE 100 closed 2.5% lower at 6,702. BG Group fell 7.4% and Tullow Oil lost 7%, after a 3.5% fall in the price of crude oil.
Goldman Sachs said oil prices would reverse recent gains as global reserves of oil continue to increase.
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